我们曾有一段长久、愉快而富有成效的关系。

We had a long, happy, fruitful relationship.

《柯林斯英汉双解大词典》

对我来说，它能帮助年轻人过上幸福、健康和富有成效的生活。

For me it's helping young people to live a happy, healthy and productive life.

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它能否催生出更富有成效的员工来？

Will it lead to more productive employees?

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and it's been a really rewarding experience and I'm glad that it's something that I've done.

有了一段富有成效的经历。我很高兴我选择了这份工作。

I've been 实战 - SpeakingMax英语口语达人