coolness [ˈku:lnəs]

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附加级

n.冷静；凉快；冷淡；厚颜无耻

the delicious coolness of the water 清凉爽口的水
We trusted to his coolness,and he didn't fail us. 我们相信他会冷静对待，他没有让我们失望。来自《简明英汉词典》