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。
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.
我看见这样的情形，高兴得手足舞蹈起来。
针灸者当然也知道要把针刺入病人哪一个为之这样才可以使得手术部分不会疼痛。
This person also knows where to place the needles so the patient feels no pain in the area where the operation is to be performed.
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