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来源：雅诚德英语网
As this air is warmed and picks up moisture, it becomes lighter than the air above it.
当这些空气被加热并吸收了水分，它会变得比上面的空气轻。
As this air is warmed and picks up moisture, it becomes lighter than the air above it.
当这些空气被加热并吸收了水分，它会变得比上面的空气轻。