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英语句子成分if,however,there are too many or too few neutrons,that

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英语句子成分
if,however,there are too many or too few neutrons,that nucleus becomes unstable-in other words,it is radioactive
这里if that 引导的是什么从句,破折号后的又是什么句子,主句在哪?
英语句子成分if,however,there are too many or too few neutrons,that
【解析】:1.整句话意为:然而,如果有太多货太少中子的话,那个原子核会变得不稳定.换句话说,它是有辐射的.
2.if,意为“如果”,引导条件状语从句,而that在此处作代词,意为“那个”,不是作连词,并不引导从句.
3.破折号后的句子是另起一句,与前头无关.前边一个句子的主句是“that nucleus becomes unstable”,if引导的那个句子是从句.