“冷静的”的英语可以翻译为：sober，calm，dispassionate，inexcitable，self-possessed ...

那需要运动员有高超的技巧、冷静的头脑和迅速的反应能力。It takes great skill, cool nerves and the reflexes of an athlete.显然，她是全家口才最好、最沉着冷静的人。She is clearly the most articulate and self-possessed member of her family.她是个很冷静的家伙。She's a real cool ...