反应堆芯 fǎnyìngduīxīn reactor core Definitions Defs Origin Strokes Stroke Words Sentences Sents 反应 反應 fǎnyìng nounverb to react to respond to a stimulus biologically or medically or to react to a situation; response; reaction堆芯 duīxīn reactor core the central part of a nuclear reactor where fission occurs