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    red line

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    red lineBrE /ˌred ˈlaɪn/ 🔊NAmE /ˌred ˈlaɪn/ 🔊 nounan issue or a demand that one person or group refuses to change their opinion about during a disagreement or negotiations （争论或谈判中）拒绝改变立场的问题（或要求）◆The issue of sovereignty is a red line that cannot be crossed. 主权问题是一条不能跨越的红线。🔊🔊