三天打鱼两天晒网的英文：
[Literal Meaning]
three/day/fish, two/day/dry/net
to fish for three days while drying the nets for two days

[解释]
比喻对学习、工作没有恒心，经常中断，不能长期坚持。

[Explanation]
(of a person) lacking perseverance

[例子]
干任何事都不能三天打鱼，两天晒网，否则就会什么都干不成。

[Example]
You should not work by fits and starts, otherwise you will never get anywhere.

[英文等价词]
by fits and starts