我把句子变一下,变成陈述句,air is the only acoustic medium which sound can propagate through
空气是唯一的声音能够传播的声学媒介.
变成疑问句时,介词提前到引导语which前引导定语从句
我把句子变一下,变成陈述句,air is the only acoustic medium which sound can propagate through
空气是唯一的声音能够传播的声学媒介.
变成疑问句时,介词提前到引导语which前引导定语从句