蓬松度是指羽绒蓄含空气和膨胀的能力。

Down power to inflate and fill up with air.

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这种膨胀能够导致空气温度降到零度以下的程度。

This expansion can cause the temperature of the air to drop to sub-zero levels.

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这种膨胀能够导致空气温度降到零度以下的程度。

This expansion can cause the temperature of the air to drop to sub-zero levels.

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