镇定下来

calm down; collect one's faculties

1. 上讲台以前他先于自己镇定下来。
   He collected himself before getting up onto the platform.
2. 镇定下来吧，你这样紧张激动，完全是莫名其妙。
   Calm down, you're getting terribly wrought up over nothing.

镇的英语翻译：

定的英语翻译：

下来的英语翻译：