“镇静地”的英语可以翻译为：undisturbedly，sedately，unflappably ...

镇静地应付了困难的局面.Carried off the difficult situation with aplomb.她从惊慌中恢复过来, 并且镇静地给予了回答.She recovered from her surprise, and answered calmly.我十分镇静地逃了出来.I had much presence of mind to bring myself off....