In English, "心平气和" can be translated as "calm and composed" or "at peace". It is derived from the Chinese phrase "心平气和", which literally means "calm heart and composed breath".

Here are some example sentences using "calm and composed" in English:

Despite the chaos around him, John remained calm and composed.

She took a deep breath and tried to remain calm and composed during the interview.

After years of practice, he was able to stay calm and composed in any situation.

In Chinese, these sentences would be translated as:

尽管周围很混乱，约翰还是保持着心平气和。

她深吸一口气，试图在面试时保持心平气和。

经过多年的练习，他能在任何情况下保持心平气和。