Concentring
v. 集中于一点
🗣️ 情景例句
I can't believe it!
我简直不敢相信！
To teeter-totter
玩跷跷板
First of all, it's been improved. And it's bigger, although it's more expensive.
首先，它已作了改进。而且机子较大，尽管价格贵些。