例15　Speech has to be triggered and this depends on the interaction between the mother and the child, where the mother recognizes the signals in the child's crying, smiling, and responds to them.

【结构分析】句子的主干是两个并列句子，第一个并列句子是Speech has to be triggered，第二个并列句子是this depends on the interaction，后面是介词短语between the mother and the child，修饰前面的名词，后面加上定语从句where the mother recognizes the signals in the child's crying, smiling, and responds to them，修饰前面的名词。

【亮点回放】此句话的亮点是介词短语套上定语从句，定语从句很长，很有气势。

【核心词汇】

trigger　激发

interaction　互动

recognize the signals　确认信号

respond to　回应

【参考译文】语言是可以被刺激的，而且这种刺激取决于母亲和孩子之间的互相交流，通过这种交流，母亲确认孩子的哭声和笑声，然后对这些声音产生回应。