fruitful
adj. 成果丰硕的，富有成效的；富饶的，多产的；（人）多子多孙的
例句
We had a long, happy, fruitful relationship.
我们曾有一段长久、愉快而富有成效的关系。
《柯林斯英汉双解大词典》
Their efforts have been proven fruitful.
事实证明他们的努力是有成效的。
The work will be more fruitful under this plan.
按照这一方案，做这工作将更有成效。
《新英汉大辞典》
