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1、hold up指用暴力或武力威胁抢劫，有明确目的hold back扣住，保留抑制的意思1. hold up常表示下列意义:1) 延迟。

2、阻碍My application was held up by the postal strike.2) 搀扶;支撑;举起;抬起He held up his hand to agree to the plan.3) 举出(例子);提出(作为榜样)She is always holding up her children as models of good behavior.4) 支持住;承受住;支撑得住She’s holding up well under the pressure.2. hold back常表示下列意义:1) 阻碍，阻止He was so angry at the news that I couldn’t hold him back.2) 妨碍进展Do you think that mixed ability classes hold back the better students?。

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