productive

adj.

富有成效的；多产的；生产性的；具有创造性的

productive forces生产力

productive capacity生产能力

productive efficiency生产效率；生产效能

productive maintenance生产维修

productive time运算时间；生产时间

total productive maintenance全面生产维护

productive investment生产性投资

1. Their productive cycle covers several decades.
   它们的生产周期可延续几十年。
2. Our productive task is making the machine.
   我们的生产任务是造机器。
3. They work hard, but their efforts are not very productive.
   他们很努力，但效率不太高。
4. I spent a very productive hour in the library.
   我在图书馆里的这一小时收获很大。
5. He is a productive writer, creating many great works in his life.
   他是一个多产的作家，他一生创作了许多作品。
6. Once the plants have produced fruit, they become less productive.
   一旦收获了果实，草莓作物就变得少产了。

Is public expenditure productive?
Is public expenditure productive? ☆
Why Has Productive Growth Declined? Productivity and Public Investment
The Emilian model: productive decentralisation and social integration
Is public expenditure productive? Journal of Monetary Economics 23: 177
Restructuring the Classroom: Conditions for Productive Small Groups
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Blockade of Dll4 Inhibits Tumour Growth by Promoting Non-Productive Angiogenesis †
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Guiding Principles for Fostering Productive Disciplinary Engagement: Explaining an Emergent Argument in a Community of Learners Clas...