The consignment appears to have been roughly handled and left near a heater.
看来货物未受到细心的处理,并且被放置于加热器附近。
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。