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。

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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。

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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。

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In some companies, they may even be temporary or contract staff, sometimes provided by a large public accounting firm, if specialized expertise or extra arms and legs are needed for a merger, a restatement, or a tax problem.

FORBES: Crisis? What Crisis? Don't Blame The Accounting

But the 30-year-old Leinster star knows that if he can inspire his country to their first Six Nations success since 1985, an extra reward could be a call to arms from McGeechan.

BBC: O'Driscoll admits Lions incentive

Despite having home advantage that January day in 1996 at the old Cardiff Arms Park, Cardiff lost 21-18 to Toulouse after extra time.

BBC: Home-spun wisdom seals Cardiff Blues' European glory