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纲：鱼网的总绳；挈：提起。抓住网的总绳，提住衣的领子。比喻抓住要领，简明扼要。
[bring out the essentials by concentrating on the main points] 提网之纲,挈衣之领。比喻举其要领,扼其要害,就能理顺关系,处事得心应手
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