No. That's nog good either. But give me your number and I'll call you if somebody cancels.
不。也不行。不过请你把电话号码给我,如果友人取消约会,我就打电话通知你。
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.
我们只要看一看蝙蝠回声定位这一极不寻常的发现,就可以探究一下声音在什么情况下有绝对的实用价值。