头朝下往下划时，不要将两手都放在前面，一只手要放到身体的侧面，这是防止身体失去平衡的必要措施。

Head first down the program, do not have the hands on the front, put a hand to the side of the body, it is necessary to prevent loss of balance measures.

youdao

头朝下往下划时，不要将两手都放在前面，一只手要放到身体的侧面，这是防止身体失去平衡的必要措施。

Head first down the program, do not have the hands on the front, put a hand to the side of the body, it is necessary to prevent loss of balance measures.

youdao