| 词汇 | red line | 
| 释义 | red line  noun [ C ] uk/ˌred ˈlaɪn/ us/ˌred ˈlaɪn/  红线 a limit beyond which someone's behaviour is no longer acceptable  The pirates had crossed a red line, and there would be no giving in to their demands.  海盗们已经越过了红线,不能对他们的要求做出让步。  | 
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