pres·ence of mind
noun/ˌprezns əv ˈmaɪnd/
/ˌprezns əv ˈmaɪnd/
[uncountable]- the ability to react quickly and stay calm in a difficult or dangerous situation
镇定；处变不惊；遇事不慌 - The boy had the presence of mind to turn off the gas.
那男孩子镇定地关掉了煤气。
- The boy had the presence of mind to turn off the gas.