A man has two feet;dogs have four feet.

题目

A man has two feet;dogs have four feet.
人有两只脚,狗有四只脚.
dog为什么用复数啊?一个狗是4只脚,复数就不是4只脚了啊

答案

是统称.这和中文其实差不多. 我们一般说 "狗有四只脚", 不会说 "一个狗有四只脚"