How long has it been？
咱们多久没见了？
It's been years (since we last met).
好多年没见了。（自从上次见面）
Look at what he did！
What a mess！
看看他弄的！好乱啊！
If you turn a blind eye to this, he will keep doing it.
如果你睁一只眼闭一只眼，他还会这么做的。
No one should turn a blind eye to this.
大家不应对此坐视不管。
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