| 单词 | 寿命 |
| 释义 | 〔life〕The interval of time between birth and death:一生，寿命：从出生到死亡之间的时间：〔vintage〕Length of existence; age.寿命：存在时间长短；年代〔thorium〕A radioactive silvery-white metallic element that is recovered commercially from monazite. Its longest-lived isotope, the only one that occurs naturally, is Th 232 with a half-life of 1.41 × 1010 years. It is used in magnesium alloys, and isotope 232 is a source of nuclear energy. Atomic number 90; atomic weight 232.038; approximate melting point 1,750°C; approximate boiling point 4,500°C; approximate specific gravity 11.7; valence 4. See table at element 钍：一种商业上从独居石中提取的放射性银白色金属元素，其自然界中寿命最长的同位素是钍232，半衰期为141×1010年。用于镁合金，同位素232是核能的来源。原子序数90；原子量232.038；熔点约为1,750°C；沸点约为4,500°C；比重约为11.7；原子价为4 参见 element〔longevity〕comparing the longevities of the two peoples.比较两个民族的寿命〔senile〕In earlier writings one finds phrases such as "asenile maturity of judgment" and "green and vigorous senility, ” demonstrating that these two words have not always been burdened with their current negative connotations. Senile and senility are examples of pejoration, the process by which a word's meaning changes for the worse over time.Even thoughsenile (first recorded in 1661) and senility (first recorded in 1778) initially had neutral senses such as "pertaining to old age,” it is probable that the weakness (in particular the mental weakness) that sometimes accompanies old age eventually caused negative senses to predominate.Certainly some pejorative associations were present in Latinsenīlis, "relating to an old man, aged,” the ultimate source of both words, and in related Latin words such assenēscere, which could mean "to deteriorate with age.” But it seems that pejorative associations have taken over these words in English through general usage,perhaps because average life expectancy has risen steadily over the years.在较早的文学作品中人们可以找到形如“判断力Senile（老练） 成熟”和“精力旺盛的有魄力的 Senility（老态龙钟） ”的短语，表明这两个词一直没有表示他们流行的消极的含义。 Senile 和 senility 是词义转贬的范例， 即一个词的意思随时间变化变得越来越坏。尽管senile （首次记载于1661年）和 senility （首次记载于1778年）最初具有中性的意义，例如“关于老年的”， 可能是伴随老年出现的衰弱（特别是智力衰弱）最终导致了反面的意思居支配地位。当然有一些词义转贬的联系表现在拉丁文中的senilis （“关于老人的，老年的”），是这两个词的最早的词源， 和与之相关的拉丁词如senecer ，意为“随年纪恶化”。 但是看起来在英语中通过广泛的使用词义转贬的联系已经取代了这些词，可能是由于平均估计寿命随时代发展稳步上升〔americium〕A white metallic transuranic element of the actinide series, having isotopes with mass numbers from 237 to 246 and half-lives from 25 minutes to 7,950 years. Its longest-lived isotopes, Am 241 and Am 243, are alpha-ray emitters used as radiation sources in research. Atomic number 95; specific gravity 11.7; valence 3, 4, 5, 6. See table at element 镅：锕系元素中的一种白色超铀金属元素，其同位素原子序数是从237到246，半衰期从25分钟到7,950年。其寿命最长的同位素镅241和镅243在研究中用作α射线辐射源。原子序数为95；比重11.7；原子价为3,4,5,6 参见 element〔redshirt〕To keep (a college or school athlete) out of varsity competition for one year in order to extend the athlete's period of eligibility.使成为红衫运动员：为延长运动员的运动寿命而使（学院或学校运动员）一年不参加校际比赛〔unstable〕Decaying with relatively short lifetime. Used of subatomic particles.衰变的：具有相对较短的寿命而衰变，常用于亚原子粒子〔expectancy〕a life expectancy of 70 years. Also called In this sense, also called expectation 预计70岁的寿命 也作 在此意义上也可称作 expectation〔lawrencium〕A short-lived, radioactive synthetic transuranic element produced from californium and having isotopes with mass numbers 255 through 260 and half-lives of a few seconds to three minutes; atomic number 103. See table at element 铹：一种寿命期短的、人工合成的放射性超铀元素，从锎中生成，有质量从255到260的同位素，半衰期从几秒钟到三分钟；原子序数103 参见 element〔longevity〕Length or duration of life:寿命：生命的长度或持续时间： |
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