We swing our arms simply because it would take extra mental and physical effort to keep them still, says Herman Pontzer, a biomechanics researcher at Washington University in st Louis.
根据圣路易斯华盛顿大学生物力学专家Herman Pontzer的说法，我们之所以要摆臂，是因为不这样的话就需要在意识上以及生理上额外花些气力才能使得手臂保持静止。
Supervisors judged that Swiss Banks needed extra safeguards to calm the nerves of clients of their huge private-banking arms.
监督者认为，为了平抚那些处于他们庞大私人银行业分支的客户的神经，瑞士的银行需要更多的安全保障。
Another new Arms talent called Blitz will make the Charge ability hit for extra damage. The amount will possibly vary depending on the distance travelled.
另外一个叫做闪电战的新武器天赋会让冲锋造成额外的伤害。该伤害可能会因为冲锋的距离而改变。
It took more energy to start spinning with her arms extended, so as she draws them in, that extra energy is converted into faster spinning.
如果他展开双臂来开始旋转这会耗掉她很多力气。因此，她把手向上伸，这样额外的能量会转化为更快的旋转。
A 3-year-old Indian girl born with 4 arms and 4 legs has taken her first steps 8 months after surgeons removed he extra limbs.
印度一个3岁女孩天生有4条胳膊和4条腿，8个月前，她接受手术切除了多余肢体，现在已开始学走路。
I ordered an extra large boy with beefy arms. Extra guts and glory on the side. This here. This is a talking fish bone!
我要的是壮如牛的男孩，另外还得有勇气和荣誉感。这个，你给我的分明是火柴棒！
Researchers have studied 2798 people for 5 years and found that women with longer arms and legs had a much lower risk of dementia, with every extra inch of leg reducing their risk by 16%.
研究者对2798人进行5年调查，发现四肢长的女性不易得痴呆，其中腿每长一英寸，患病风险降低16%。
Methods: In 10 matched pairs of fresh-frozen cadaveric arms, a comminuted extra-articular dorsally unstable distal radius fracture (OTA type 23-A3.2) was created.
方法：在10对新鲜冷冻的尸体手臂上，造成关节外桡骨背侧不稳定性骨折（OTA 分型23-A3.2）模型。
A two-year-old girl born with four arms and four legs has regained consciousness after a 24-hour operation to remove the extra limbs.
这名四个胳膊和四条腿的2岁女孩经过24小时的截肢手术后恢复了意识。
Jany Temime designed new Quidditch uniforms, including a training outfit, which she describes as "basically like a track suit with extra padding on the arms and legs and a leather helmet."
贾尼·泰米设计了新的魁地奇球服，包括训练装，她将之描述为“实际上很像普通的套装，只不过在胳膊和腿上加了垫衬，又加了一个皮头盔。”
Jany Temime designed new Quidditch uniforms, including a training outfit, which she describes as "basically like a track suit with extra padding on the arms and legs and a leather helmet."
贾尼·泰米设计了新的魁地奇球服，包括训练装，她将之描述为“实际上很像普通的套装，只不过在胳膊和腿上加了垫衬，又加了一个皮头盔。”
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