Olefine
[化] 烯烃; 链烯烃
🗣️ 情景例句
He keeps himself fit by running 5 miles every day.
他每天跑五公里以保持身体健康。
How much is the rent?
租金要多少钱？
You could save a lot if you would order a little more.
如果你单子下得多一点，可以省不少的钱。