Dialkene
二烯烃
🗣️ 情景例句
Just a minute. Here's your receipt.
请等一下。这是你的收据。
Today is my birthday.
今天是我的生日。
Two men took the parcel off the plane and carried it into the Customs House.
有两个人把包裹拿下飞机，进了海关。