Diethylidene
[化] 二亚乙基; 2-丁烯
🗣️ 情景例句
I'm calling to know if it would be at all possible to cancel our reservation.
我打电话想知道我们的预约是否有可能取消。
I have to hang up now.
我现在不得不挂电话了。
'Oh dear,' said the conductor suddenly.
“哎呀，”售票员突然说，