Polyalkane
聚链烷
🗣️ 情景例句
Haven't you finished balancing that checkbook?
你还没有核对完支票簿帐目吗？
I'm afraid I won't be able to come.
我恐怕不能来。
We've got some cheaper ones in the back room.
后面房间里有一些比较便宜的。