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。

youdao

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。

youdao