Take a seat in a comfortable chair with feet flat on the floor and uncrossed.

在一个舒适的椅子中坐下，双脚平放在地板上，不要交叉。

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Sit deep in your seat with both feet flat on the floor.

坐在椅子上时双脚能平放在地。

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Sit deep in your seat with both feet flat on the floor.

坐在椅子上时双脚能平放在地。

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