| 单词 | 致密 |
| 释义 | 〔tuff〕A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel. Also called tufa 凝灰岩：致密火山灰构成的岩石，大小以细粒至粗砾石不等 也作 tufa〔solid〕Firm or compact in substance.See Synonyms at firm 1紧密的：物质上牢固的或致密的 参见 firm1〔meerschaum〕A fine, compact, usually white claylike mineral of hydrous magnesium silicate, H4Mg 2Si 3O 10, found in the Mediterranean area and used in fashioning tobacco pipes and as a building stone. Also called sepiolite 海泡石：氢氧化镁的矽酸盐矿石，通常为优质致密的白色陶土状物，H4Mg 2Si 3O 10，产于地中海地区，用来制作烟斗和建筑用石 也作 sepiolite〔dense〕Permitting little light to pass through, because of compactness of matter:不透光的：由于物质致密而几乎不允许光透过：〔periosteum〕The dense fibrous membrane covering the surface of bones except at the joints and serving as an attachment for muscles and tendons.骨膜：覆着骨表面的致密膜，关节处除外，起连接肌肉和筋腱的作用〔basalt〕A hard, dense, dark volcanic rock composed chiefly of plagioclase, pyroxene, and olivine, and often having a glassy appearance.玄武岩：一种硬的、致密的、黑色的火山岩。它主要由斜长石、辉石和橄榄石组成，外表经常很光滑〔mangrove〕Any of several tropical evergreen trees or shrubs of the genusRhizophora, having stiltlike roots and stems and forming dense thickets along tidal shores. 红树：任一种属于热带海岸红树 属的热带常绿乔木或灌木，具有织状致密的根和茎，在有潮汐的海岸群生密长 〔tight〕Leaving little empty space through compression; compact:密集的：通过压缩留下很少空间的；致密的：〔stishovite〕A dense tetragonal polymorph of quartz that is formed under great pressure and is often associated with meteoroid impact.超石英：一种致密的四方形石英矿物，常在高压下生成，并与流星撞击有关〔porphyry〕Rock containing relatively large conspicuous crystals, especially feldspar, in a fine-grained igneous matrix.斑岩：含有嵌入致密的合成基质的相对较明显的长石晶体的岩石〔novaculite〕A very hard, dense, even-textured, silica-bearing sedimentary rock used in whetstones.均密石英岩：非常坚硬，致密，结构均匀，含硅的沉积岩，用作磨石〔aphanite〕A dense, homogeneous rock with constituents so fine that they cannot be seen by the naked eye.隐晶岩，非显晶岩：一种成分细密肉眼不能看到的致密同质岩石 |
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