Reaction boundary
[机] 反应曲线
🧩 词语组成解析
🗣️ 情景例句
It's certainly a pleasure to meet you.
认识你真是我的荣幸。
This pencil is longer than that one.
这支铅笔比那一个长。
One moment we were walking along the top of a hill and now we could see no more than about thirty metres ahead of us.
一时间我们还在山顶上行走，而现在30公尺开外的地方我们都看不清了。