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词汇 辐射性
例句 When energetic particles or quanta of radiation pass through a crystal, they excite a few of its atoms into a higher energy state.辐射性的高能粒子或量子穿过晶体时,会把晶体的一些原子激发成更高的能态。This substance is so radioactive that it glows in the dark.这种物质辐射性很强,在黑暗中都可以发出亮光。
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