| 单词 | metal |
| 释义 | metal [`med·ǝl] ASTRONOMY In stellar spectroscopy, any element heavier than helium. MATERIALS An opaque crystalline material usually of high strength with good electrical and thermal conductivities, ductility, and reflectivity; properties are related to the structure, in which the positively charged ions are bonded through a field of free electrons which surrounds them forming a close-packed structure. |
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