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问题: 语法问题

By the time it is due to hatch,the glow-worm's
light organ is fully developed,and its flow
signal that the egg will soon hatch.在萤火虫孵化出来之前,它的发光器官已经发育成熟,并且发色很难过即将破壳而出的信号。
问题是 后面这个and its flow
signal that the egg will soon hatch
只是一个名词结构 该怎么理解他在全句子的语法成分呢?

解答:

这里的flow是名词,signal是动词,发光器的涌动表明蛋要孵化了。