Norbornadiene
[化] 降冰片二烯
??? 情景例句
How come you look so tired?
你怎么看起來這么疲倦？
John could not decide when to leave.
約翰無法決定幾時要出發。
it would be more like that of a bluebottle buzzing round the room;
那就像一只嗡嗡叫的綠頭蒼蠅在屋內飛行的軌跡，