Any of you who have access to a four- or five-year-old, a sibling or something-- Do not take one without permission, but if you have access to a four- or five-year-old you can do this yourself.

如果你身边有四五岁大的孩子,兄弟姐妹什么的,一定要先得到同意再去试验,如果你身边有四五岁大的孩子,你可以自己去试试

耶鲁公开课 - 心理学导论课程节选

And it's a way to ask permission without being pushy or uncomfortable.

这种请求允许的方式不会让人有强迫或不适的感觉。

Let me 课堂 - SpeakingMax英语口语达人