Bats 蝙蝠

课前问题

In what way does echo-location in bats play an utilitarian role?

蝙蝠的回声定位是如何发挥实用作用的？

课文首句

Not all sounds made by animals serve as language, and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian role.

并非所有动物发出的声音都作为语言，我们只需看看蝙蝠回声定位这项非凡的发现，就能明白声音在其中扮演着严格实用性角色的例子。