red line - 세계는 지금.

• red line /ˌred ˈlaɪn/
-an issue or a demand that one person or group refuses to change their opinion about during a disagreement or negotiations
: 레드 라인(불화·협상 시 한쪽 당사자가 양보하지 않으려는 쟁점이나 요구)
e.g.) 
The issue of sovereignty is a red line that cannot be crossed.
   주권 문제는 넘을 수 없는 레드 라인이다.

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