Peek-a-boo (lower back): Lie face down on the floor using your outstretched arms to support baby in front of you.

躲猫猫（锻炼后腰）：脸朝下，用你伸展的胳膊支撑住你前面的婴儿。

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Remember to protect your head and neck with your arms.

记得用你的胳膊保护你的头和脖子。

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Come to the arms of your wooden brothers!

到你木偶兄弟的怀里来吧！

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You need energy to move your arms around and move around mechanical systems, obviously, cars, boats, etcetera.

你需要能量,来移动胳膊和走动,机械系统，汽车，船等等。

麻省理工公开课 - 热力学与动力学课程节选

Rather, what happened is you heard English and--but the capacity grew in your head and something a lot more similar to the development of arms or legs or a visual system.

相反,你听到了英语,你脑中的英语能力得到增长,这个和手臂,下肢,或是视觉系统的发育很相似

耶鲁公开课 - 心理学导论课程节选

If his arms are crossed, then slowly begin to cross your arms.

FORBES: The Art and Science of Mirroring

It may appeal to your wallet, but if your arms are used to flinging around Ultrabooks for fun, this probably won't be the machine for you.

ENGADGET: Fujitsu's German-made Lifebook AH562 turns up at CeBIT, we go hands-on

With a tandem jump you sign a release form, put on a jumpsuit and are quickly shown what to do once you leave the plane: how to cross your arms and bend your legs while in mid-air.

BBC: Falling into New Zealand, from 10,000 feet