have a strong and obvious effect or influence on others or on a situation
引起别人注意自己的存在，使自己对人（或形势）有强烈且明显的影响
the ability to remain calm and take quick, sensible action
镇定自若，遇事不慌
he had the presence of mind to record the scene on video.他镇定自若地用摄像机录下现场。
he had the presence of mind to record the scene on video.
他镇定自若地用摄像机录下现场。