受用不尽的英文：
enjoy a benefit forever
benefit from sth. all one's life

参考例句：

To enjoy the benefit or reward all one’s life
一生受用不尽

enjoy是什么意思：
v. 从…获得乐趣；欣赏；喜爱；享有

Liberties are enjoyed by all citizens.
公民皆享有自由权。

I enjoy light wine.
我爱喝清淡的酒。

Goods are theirs that enjoy them
能享受自己财产的人是财产的真正主人

benefit是什么意思：
n. 利益，好处；救济金，津贴；利润
v. 有益于，受益

benefit of the doubt
裁判员对可疑情况无把握时不对有关运动员作不利判定

It is possible to overstate the benefits of stabilization.
稳定性带来的好处有可能被夸大。

The flowers were a fringe benefit.
这些鲜花可算是额外的报酬。

forever是什么意思：
adv. 永远；老是

always; forever
老是

The drive seemed to take forever.
车似乎永远也开不到头。

Once a use forever a custom
习惯成自然