Concentrations
n. 集中( concentration的复数形式 ); 专心; 关注; 浓度
🗣️ 情景例句
It's time I was off.
我该走了。
Excuse me I couldn't come.
对不起我不能来。
Where can we make the insurance claim?
我们可以在哪里提出保险赔偿？