被打死的警察后脑勺开了花，他的身体还在断断续续地抽搐，却无法挣脱安全带的束缚挺直。
The dead marshal jerked spasmodically as the back of his head blew out, but the safety belt kept him erect in the chair.
为了唤醒你的头脑和身体，用一种舒服的坐姿坐在地板上，后背挺直。
To recenter your mind and body, sit on the floor in a comfortable position with a straight back.
许多田径教练将这一理想身姿描述为“跑得高挑”，意思是您跑步时需要将身体伸展至您的最大身高，背部舒服地挺直。
Many track coaches describe this ideal torso position as "running tall" and it means you need to stretch yourself up to your full height with your back comfortably straight.
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