Some products can be recycled at the end of their useful life.

有些产品过了有效使用年限后是可以回收再利用的。

If you are food, do you foster useful life?

如果你是一颗粮食，你是否哺育了有用的生命？

During his useful life he often felt he was useless.

在他大有作为的一生中他老是感到自己无用。

During ghis useful life he often felt he was useless.

在他大有作为的一生中他老是感到自己无用。

Cant wiped off by alcohol, clear font, long useful life.

防酒精擦式，字体清晰不掉落，使用寿命长。