It's good for every day. It will be good for school, Michelle.
这套衣服每天都可以穿。它适合上学时穿, Michelle。
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。