Olefines
(olefine 的复数) [化] 烯烃; 链烯烃
🗣️ 情景例句
I'll be in the front office all day.
我整天都在总办公室。
How much is a round-trip ticket to Beijing?
一张到北京的来回票要多少钱？
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。