要在商业上成功，你需要在谈判中保持冷静。

To be successful in business, you need to ___keep ___a ___cool ___head in negotiations.

凯文设法保持冷静，并接管了导航。

Kevin managed to ___keep ___a ___cool ___head and took over the navigation.

在紧急情况下，保持冷静头脑以做出理性决定至关重要。

In emergencies, it's crucial to ___keep ___a ___cool ___head to make rational decisions.