Allenes
二烯烃
🗣️ 情景例句
We'll have a great time camping out, I'm sure.
我确定我们会在露营时玩得很开心。
We are sorry to delay the shipment because our manufacturer has met unexpected difficulties.
恕延期货船，因为我们厂家遇到了预料不到的困难。
George showed me to the guestroom which, he said, was rarely used.
乔治把我领进客房，说这间很少使用。