我们开了一个非常富有成效的会议，解决了很多问题。

We had a very ___productive meeting and worked out a lot of the problems.

当然，你可以学到东西，但观察它们在自由状态下会更有效果。

Of course, you can learn things, but it would be more ___productive to observe them when they are free.

她这周非常高效，按时完成了所有任务。

She has been very ___productive this week, completing all her assignments on time.