即使在巨大压力下，你也必须在谈判中保持冷静。

Even under intense pressure, you must ___keep ___a ___cool ___head during negotiations.

尽管发动机发生故障，机长仍保持冷静并使飞机安全着陆。

Despite the engine failure, the captain ___kept ___a ___cool ___head and safely landed the plane.

事故发生时，那位护士保持了冷静并立即进行了急救。

When the accident occurred, the nurse ___kept ___a ___cool ___head and provided first aid immediately.