1.岁月不待人。
Time and tide wait for no man. *tide 是潮水，此处与time同义，表示时间。

2.越快越好。
The sooner, the better.
When should I come over? (什么时候来合适?)
The sooner, the better. (越快越好。)

3.正好。
On the nose.
How many people came to the party? (有多少人来参加晚会?)
A hundred people, on the nose. (正好100人。)
Exactly.
On the dot.

4.捉迷藏。
Hide-and-seek
Let's play hide-and-seek. (我们玩捉迷藏吧。)
Okay. (好吧。)