All work and no play makes Jack a dull boy.

只工作不玩耍，聪明杰克也变傻。

Dull boy: 呆笨的男孩。可以看看下面的例子: You're not going to study all weekend, are you? Remember, all work and no play makes Jack a dull boy.你不会把整个周末都用于学习，是不是？要记住，有劳无逸，有害无益。