| 单词 | uranium |
| 释义 | uranium [yǝ`rā·nē·ǝm] CHEMISTRY A metallic element in the actinide series, symbol U, atomic number 92, atomic weight 238.03; highly toxic and radioactive; ignites spontaneously in air and reacts with nearly all nonmetals; melts at 1132°C, boils at 3818°C; used in nuclear fuel and as the source of 235U and plutonium. METALLURGY A dense, silvery, ductile, strongly electropositive metal. |
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