楼梯变成平行活动空间。

The stairway becomes a place for parallel activities.

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把它们当作业余活动或平行的工作从而能认真试验而不用承诺什么。

Try to do these as extracurricular activities or parallel paths so that you can experiment seriously without making a commitment.

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在两岁时，你的孩子可能和其他孩子一起玩，但并不与他们交流——这种活动叫做平行游戏。

At age 2, your child probably played alongside other children but did not interact with them-an activity called parallel play.

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