Ack1
[计] 确认, 肯定, 奇肯定应答
🗣️ 情景例句
She was sick so the didn't attend her classes.
她生病了，所以没上学。
Bite the hand that feeds one.
恩将仇报。
For instance, if you are older you have less time to recover from any major losses,
比如说，如果你年纪较大，你从重大投资损失中恢复过来的时间就较少，