take in air and send it out through their nose or mouth
问题描述:
take in air and send it out through their nose or mouth
nose 和mouth需要用复数吗?不用为什么
答
take in air and send it out through their nose or mouth.吸入空气,通过鼻子或口呼出.
这里的nose or mouth是泛指人的.指的是他们每个人的鼻子或口,不是说所有人的多个鼻子或口.用一个人的鼻子或口代指所有人的.