Examples
tā他kàn qǐ lai看起来wán quán完全wú fǎ无法zhèn dìng镇定。
他看起来完全无法镇定。
Looks like he has completely lost his composure.
想成为一个好的击球手的话，你要在球场上时刻保持镇定，还要学会相信自己的直觉。
To be a good batter, you've got to hang loose and follow your instincts.
无论发生甚么事，你也要保持镇定。
Stay calm whatever happens.