Obama sat like a jazz musician on his chair, one heel hooked at an angle, while McCain sat as if he might leap up at any moment, or stood impatiently waiting for his turn to speak.

奥巴马勾起一只脚后跟，看上去像是一个爵士乐手；而麦凯恩则连坐着都好像是时刻准备着奋起作战的样子，如果他站着作答，表情上会看出有些不耐烦。

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But that expansionary zeal may turn out to be the firm's Achilles' heel.

但是那种膨胀性的热诚或许会成为这家公司的软肋。

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To turn the heel, tiptoe to close within.

脚跟向外转动，脚尖向内靠紧。

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So it is clear that Israel cannot simply turn its back on the free world's Achilles heel.

CENTERFORSECURITYPOLICY: The Free World's Achilles Heal

The party's Achilles' heel--its lack of any independent check on its power--undermines at every turn its efforts to police corruption, vet its members, reform its bureaucracy and respond to crises.

FORBES: Beijing Dispatch