adj.生产的；有成效的；多产的

Their productive cycle covers several decades. 它们的生产周期可延续几十年。

Our productive task is making the machine. 我们的生产任务是造机器。

They work hard, but their efforts are not very productive. 他们很努力，但效率不太高。

I spent a very productive hour in the library. 我在图书馆里的这一小时收获很大。

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。