have a strong and obvious effect or influence on others or on a situation
引起別人注意自己的存在，使自己對(duì)人（或形勢(shì)）有強(qiáng)烈且明顯的影響
the ability to remain calm and take quick, sensible action
鎮(zhèn)定自若，遇事不慌
he had the presence of mind to record the scene on video.
他鎮(zhèn)定自若地用攝像機(jī)錄下現(xiàn)場。