他平静口气
He took a calm tone
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他深深地吸了几口气，使自己平静下来。
He took a few deep breaths to calm himself down.
《牛津词典》
他深深地吸了几口气，让自己平静下来。
He took a few deep breaths to steady his nerves.
他深呼吸了一口气，使自己平静下来。
He took a deep breath, and calmed himself.
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