| 单词 | 周期 |
| 释义 | 〔periodical〕A publication issued at regular intervals of more than one day.期刊：以多于一天的周期定期出版的出版物〔moon〕The natural satellite of Earth, visible by reflection of sunlight and having a slightly elliptical orbit, approximately 356,000 kilometers (221,600 miles) distant at perigee and 406,997 kilometers (252,950 miles) at apogee. Its mean diameter is 3,475 kilometers (2,160 miles), its mass approximately one eightieth that of Earth, and its average period of revolution around Earth 29 days 12 hours 44 minutes calculated with respect to the sun.月亮，月球：地球的天然卫星，通过反射太阳光而发光，并有一个略呈椭圆形的轨道，在近地点时，距离约有356,000公里(221,600英里），在远地点距离约有406,997公里(252,950英里）。它的平均直径为3,475公里(2,160英里），它的质量约为地球的八十分之一，参照太阳，它围绕地球旋转的平均周期为29天12小时44分钟〔periodical〕Of or relating to a publication issued at such intervals.期刊：属于或关于一种以这种周期出版的〔circadian〕Relating to or exhibiting approximately 24-hour periodicity.昼夜节律的，24小时的：与24小时周期相关或大约每24小时周期出现的〔astatine〕A highly unstable radioactive element, the heaviest of the halogen series, that resembles iodine in solution. Its longest lived isotope has a mass number of 210 and has a half-life of 8.3 hours. Atomic number 85; melting point 302°C; boiling point 337°C; valence probably 1, 3, 5, 7. See table at element 砹：极不稳定放射性元素，在卤族元素比重最大，在溶解状态与碘相象，它最长周期的同位素原子量为210，半衰期为8.3小时。原子序数85；溶点302°C；沸点337°C；化合价可能为1、3、5、7 参见 element〔low〕Having a pitch corresponding to a relatively small number of sound-wave cycles per second.低音的：与一相对少量的每秒钟音波周期相对应的低音的〔cycle〕Sunspots increase and decrease in intensity in an 11-year cycle.太阳黑子以十一年为一个周期增强和减弱〔plutonium〕A naturally radioactive, silvery, metallic transuranic element, occurring in uranium ores and produced artificially by neutron bombardment of uranium. Its longest-lived isotope is Pu 244 with a half-life of 76 million years. It is a radiological poison, specifically absorbed by bone marrow, and is used, especially the highly fissionable isotope Pu 239, as a reactor fuel and in nuclear weapons. Atomic number 94; melting point 640°C; boiling point 3,235°C; specific gravity 19.84; valence 3, 4, 5, 6. See table at element 钚：一种天然地放射性银色超铀金属元素，存在于铀矿中，对铀元素进行中子轰击而人工制成。其存在周期最长的同位素是半衰期为七千六百万年的钸244，它是一种核辐射毒素，特别是能被骨髓吸收。尤其是其极具可裂变性的同位素钸239，被用作一种核反应燃料并用在核武器中。原子序数94；熔点640°C；沸点3,235°C；比重19.84；化合价3, 4, 5, 6 参见 element〔periodic〕Having or marked by repeated cycles.周期的，周期性的：循环往复的或以此为特征的〔homology〕The relation of the elements of a periodic family or group.同周期：同一周期族或组的元素的关系〔cycle〕An interval of time during which a characteristic, often regularly repeated event or sequence of events occurs:周期，循环期：一段时间间隔，在这段时间里通常是有规律重复的事件或者其后果会出现：〔fundamental〕Of or relating to the component of lowest frequency of a periodic wave or quantity.基波的：周期波或周期量的最低频率的分力的或与此有关的〔cycle〕To move in or as if in a cycle.循环：周期地或者好象周期性地运动〔periodicity〕The quality or state of being periodic; recurrence at regular intervals.周期性：周期出现的性质或状态；以固定的间隔而发生〔monocyclic〕Having a single cycle, as of activity or development.单循环的：具有单一周期的，如指活动或发展〔Mercury〕The smallest of the planets and the one nearest the sun, having a sidereal period of revolution about the sun of 88.0 days at a mean distance of 58.3 million kilometers (36.2 million miles) and a mean radius of approximately 2,414 kilometers (1,500 miles).水星：行星中最小且离太阳最近的星，围绕太阳公转所需的周期为88.0天，公转的平均距离约为58,300,000公里（36,200,000英里），平均半径约为2,414公里（1,500英里）〔revolve〕To recur in cycles or at periodic intervals.循环往复：在周期中或周期性间隔中重复出现〔lattice〕A regular, periodic configuration of points, particles, or objects throughout an area or a space, especially the arrangement of ions or molecules in a crystalline solid.点阵：一定范围内由点、微粒或物体组成的规则的有周期的结构，尤指结晶体的离子或原子排列〔revolving〕Available at regular intervals.周期的：可在有规律的间隔中获得的〔period〕Perhaps more than once one may have wonderedwhy the wordperiod has the sense "punctuation mark ( . )” as well as some of its other senses having to do with time.The answer to this question lies in the senses of the Greek wordperiodos from which our word is descended. Periodos, made up of peri-, "around,” and hodos, "way,” meant such things as "going round, way round, going round in a circle, circuit,”and with regard to time "cycle or period of time.”The word also meant "the period of menstruation.”In rhetoric it referred to "a group of words organically related in grammar and sense.”The Greek word was adopted into Latin asperihodos with only its rhetorical sense and one other sense,but in Medieval Latin it reacquired senses it had in Greek,such as "cycle,” and acquired a new sense,"a punctuation mark used at the end of a rhetorical period.”Although this sense is recorded in Medieval Latin,it is not recorded in English until 1609.But the wordperiod had entered Middle English from Medieval Latin and Old French, first being recorded in a work written around 1425in the sense "a cycle of recurrence of a disease.”或许任何人都会不止一次的发出疑问，为什么period 有“标点符号（。）”的意思， 同时其它意思与时间有关。此问的答案来自我们的单词源自的希腊语单词periodos 的意思。 Periodos ，由意为“周围”的 peri- 和意为“方式”的 hodos 组成， 该词意味着“围绕…走，围绕…的路，转圈走，围绕，”同时也指时间，意为“一段时间或时间周期”。此词也意为“经期”。在修辞学中指“一组在语法和词意上有机相连的词。”这个希腊词作为perihodos 被拉丁文所采用， 仅带有修辞和一个其他的意思，但在中世纪拉丁语中它重新得到了它在希腊语中的意思，例如“周期”，后来又得到一个新的意思，即“用于修辞部分末尾的标点符号”。尽管此意在中世纪拉丁语中有记载，但直到1609年才在英语中有记载。而period 从中世纪拉丁文和古法语中进入中世纪英语， 并首次记载于约1425年所著的作品中，意为“疾病发作的周期”〔Perseid〕One of a shower of meteors that appears to originate in the vicinity of the constellation Perseus during the second week of August.英仙（座）流星，八月流星：在八月的第二周期间，出现而产生于英仙座附近的流星群的流星雨之一〔lunation〕The time that elapses between successive new moons, averaging 29 days, 12 hours, 44 minutes; a lunar month.朔望月：相继两次新月间的时期周期，平均二十九天十二小时四十四分；一个朔望月〔Halley〕English astronomer who applied Newton's laws of motion to predict correctly the period of a comet (1705).哈雷，埃德蒙：(1656-1742) 英国天文学家， 1705年运用牛顿的运动定律准确预测了一颗彗星的出现周期〔return〕A recurrence, as of a periodic occasion or event:周期：周期性的活动或事件的再现：〔revolving〕Tending to revolve or happen repeatedly.周期的，循环的：倾向于旋转或重复发生的〔bearing〕The act, power, or period of producing fruit or offspring.生产期，结实期：结果实或产仔的行为、能力和周期〔curium〕A silvery, metallic synthetic radioactive transuranic element. Its longest lived isotope is Cm 247 with a half-life of 16.4 million years. Atomic number 96; melting point (estimated) 1,350°C; valence 3. See table at element 锔：一种合成的银色放射性超铀金属元素。其周期最长的同位素是Cm247，该同位素的半衰期为16.4百万年。原子序数96；熔点（估计值）1,350°C；三价 参见 element〔indiction〕A 15-year cycle used as a chronological unit in ancient Rome and incorporated in some medieval systems.15年期年度：古罗马曾用过的一个纪元单位，中世纪的一些历法也曾沿用，以15年作为一个周期〔frequency〕The number of complete cycles of a periodic process occurring per unit time.次数：单位时间内周期过程中发生的次数〔cyclic〕Of, relating to, or characterized by cycles:循环的，周期性的：循环的，与循环有关的，或具有周期特征的：〔anestrus〕An interval of sexual inactivity between two periods of estrus in mammals that breed cyclically.非求偶期，不动情期：周期繁殖的哺乳动物在两个求偶期之间的不动情期〔octave〕The entire period between a feast day and the eighth day following it.从节日算起的八天周期〔month〕A unit of time corresponding approximately to one cycle of the moon's phases, or about 30 days or 4 weeks.月：大约和月亮盈亏的一个周期相当的时间单位，或约三十天或四周〔neptunium〕A silvery, metallic, naturally radioactive element, atomic number 93, the first of the transuranium elements. Its longest-lived isotope is Np-237 with a half-life of 2.1 million years. Found in trace quantities in uranium ores, it is produced synthetically by nuclear reactions. See table at element 镎：一种银白色的、金属性天然放射性元素，原子序数为93，第一个超铀元素。其周期最长的同位素为Np-237，半衰期为210万年。见于铀矿的示踪量中，由核反应合成生产出来 参见 element〔cyclic〕a cyclic pattern of weather changes.天气周期变化形式〔cycle〕A periodically repeated sequence of events:周而复始：一个周期反复的事件的后果：〔wave〕A single cycle of such a disturbance.这种振动的一个周期〔digest〕A periodical containing literary abridgments or other condensed works.周期文摘：收集的文学作品节本或其它压缩品周期刊物〔cycle〕A year constitutes a cycle of the seasons.一年由四季的周期循环组成〔compression〕The engine cycle during which this process occurs.压缩周期：上述机器压缩过程的周期 |
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