父母给孩子制定了严格的作息时间表，以限制他玩游戏的时间。

The parents set strict schedules to ___circumscribe their child's gaming time.

老师用粉笔在地板上画了一个圈，标出孩子们的活动范围。

The teacher ___circumscribed the play area for the children with chalk on the floor.

这项研究将讨论范围严格限定在气候变化的直接影响上。

The study ___circumscribed the discussion to the direct impacts of climate change.