One time,Once 一下
An action verb attached by “一下”may denote “just do something(for a little while)”. It can make the tone of voice moderate and more polite. Subj.+V+一下+(Obj)
Example: 1. 这是住房登记表,请您填一下。 This is the check-in form, please fill it out. 2. 你看一下,这是你的照片吗? Take a look. Is it a picture of you?
Substitutive dills: 我来介绍 她想休息 你坐 一下。 请你等
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