A chain is no stronger than its weakest link
st. 一环薄弱全局坏

a fair field and no favor
n. 平等的比赛条件

a point of no return
n. 航线临界点, 只能进不能退的地步

admit of no delay
刻不容缓

all dolled up and no place to go
[俚]平白无故打扮得漂漂亮亮的

A proper part-time job does not occupy students'too much time. In fact,it is unhealthy for them to spend all of time on their study.As an old saying goes:All work and no play makes Jack a dull boy.
一份适当的业余工作并不会占用学生太多的时间，事实上，把全部的时间都用到学习上并不健康，正如那句老话：只工作，不玩耍，聪明的孩子会变傻。

A rolling stone gathers no moss.
st. 滚石不生, 转业不聚财.

All work and no play makes Jack a dull boy.
只工作不玩耍，聪明杰克也变傻。

Any parents should place considerable emphasis on their children to keep the balance between play and study. As an old saying goes:All work and no play makes Jack a dull boy.
任何家长都应非常重视保持孩子在学习与玩耍的平衡，正如那句老话：只工作，不玩耍，聪明的孩子会变傻。

He eats no fish and plays the game
他忠诚而守规矩。