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I asked him to come with us, but he hung back.
我邀请他和我们一道去, 他却踌躇不前。
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When volunteers were asked for, no one hung back.
当征求志愿者时, 没有一个人退缩。
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The child always hung back from any activities.
那个孩子总是什么活动都不愿参加。
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When the police came around asking questions, he hung back from giving information.
警察前来询问时, 他迟疑不决, 不敢报告情况。