Variations
n. 变奏曲, 变更；变种（variation的复数形式）
🗣️ 情景例句
It's a deal.
成交了！
I believe there is no way out of this forest.
我相信没有路可以从这森林走出去。
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。