Work with your feet flat on the floor and your back against the chair.
工作时你的脚应该平放在地板上，而背部要靠在椅子上。
Lie on your back, feet flat on the floor, knees bent, hands at your sides.
整个背贴着躺在地上，脚板放平在地板上，两手放在身体两侧。
Lie on your back with your knees bent and feet flat on the floor.
背部着地，两膝弯曲，足平放于地面。
Find a comfortable chair or bench and sit with your back straight and your feet flat on the floor.
找一个舒适的椅子或板凳，直背而坐，双脚平放于地面。
Find a comfortable chair or bench and sit with your back straight and your feet flat on the floor.
找一个舒适的椅子或板凳，直背而坐，双脚平放于地面。
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