| 单词 | 非常坚硬 |
| 释义 | 〔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〔quartz〕A very hard mineral composed of silica, SiO2, found worldwide in many different types of rocks, including sandstone and granite. Varieties of quartz include agate, chalcedony, chert, flint, opal, and rock crystal. 石英：由硅石组成的一种非常坚硬的矿物质，SiO2，广布世界各地，存在于许多不同种类的岩石中，包括沙岩和花岗岩。石英种类包括玛瑙、玉髓、黑矽石、燧石、蛋白石及水晶 〔bumelia〕Any of various often thorny North American trees or shrubs of the genusBumelia, especially B. lanuginosa or B. lycioides of the southern United States, having very hard wood and black fleshy fruit. Also called buckthorn Also called shittimwood 药鼠李：药鼠李属 的各种多刺北美洲树木或灌木，尤指美国南部的 假鼠李 或 枸杞榄 ，木质非常坚硬，果肉呈黑色 也作 buckthorn 也作 shittimwood〔tantalum〕A very hard, heavy, gray metallic element that is exceptionally resistant to chemical attack below 150°C. It is used to make light-bulb filaments, electrolytic capacitors, lightning arresters, nuclear reactor parts, and some surgical instruments. Atomic number 73; atomic weight 180.948; melting point 2,996°C; boiling point 5,425°C; specific gravity 16.6; valence 2, 3, 4, 5. See table at element 钽：一种非常坚硬、密度很大的灰色金属元素，在摄氏150度以下能抗化学物质的强腐蚀。它被用来制造灯泡的灯芯、电解电容器、避雷针装置、核反应堆部件以及一些外科手术用的器具。原子序数为73；原子量为180,948；熔点为2,996°C；沸点为5,425°C；比重为16.6；化合价为2,3,4,5 参见 element〔marble〕Something resembling or suggesting metamorphic rock, as in being very hard, smooth, or cold:大理石似的东西：与变质岩相似或显示出变质岩特征的，比如是非常坚硬、光滑或冰冷的： |
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