4周搞定2000+托福核心词
thermonuclear = thermo(热的) + nucle(核) + ar(...的) = 高热原子核反应的
nuclear = nucle(核) + ar(...的) = 核的
核心，原子核
nuclei
常考释义
The geologic timescale is marked by significant geologic and biological events, including the origin of Earth about 4.6 billion years ago, the origin of life about 3.5 billion years ago, the origin of eukaryotic life-forms (living things that have cells with true nuclei) about 1.5 billion years ago, and the origin of animals about 0.6 billion years ago.
地质年代是由重大地质事件和生物事件标记的，包括46亿年前地球的形成、35亿年前生命的起源、15亿年前真核生物（细胞中有真核的生命体）的起源以及6亿年前动物的起源；
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