calm, peaceful, and untroubled; tranquil
安详的;宁静的
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her eyes were closed and she looked very serene 她闭着眼,看上去很平静
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serene certainty .镇静自若,胸有成竹。
〈古〉 晴空;平静的大海
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not a cloud obscured the deep serene .一片晴空,万里无云。
"late Middle English (describing the weather or sky as clear, fine, and calm): from Latin