She has ten years' useful experience behind her.

　　她有十年的經(jīng)驗(yàn)，能派上用場(chǎng)。

　　The article served as a useful starting point for our discussion.

　　這篇文章成了我們展開討論的良好起點(diǎn)。

　　This technique is useful but it has its limitations.

　　這種技術(shù)實(shí)用，但也有局限性。

　　It was a collaboration that produced extremely useful results.

　　這是一次帶來(lái)極其有益的成果的合作。

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

　　有些產(chǎn)品過(guò)了有效使用年限后是可以回收再利用的。