pull at
definitions
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to tug or pull something gently or repeatedlyzh: 轻拉或反复拉扯
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to feel a physical or emotional urge to do somethingzh: 感到想要做某事的冲动
examples
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He pulled at the thread to see if it was loose.
他轻拉线头看看是否松动。
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She pulled at her hair when she was nervous.
她紧张时扯头发。