吉 特拱起背顶住床垫，不顾一切地试图形成一个空间。
Pedrito arched his back against the mattress, desperately trying to form an air space.
预防：记得伸展和加强你的上背以缓解上背的紧张状态，因为你在办公室里总是让你的上背拱起。
Prevention: Remember to stretch and strengthen your upper back to compensate for all that hunching you do at the office.
过了一会儿，她的背拱起，胳膊和腿开始剧烈抽动。
Moments later her back arched, and her arms and legs began thrashing wildly.
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