left-hand knuckle
左手指关节
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The subjects were asked to use their free right hand point with a baton to the location of each knuckle and fingertip of their left hand.
实验对象被要求用他们空出来的右手拿着一根指挥棒，指出他们左手每个指关节和指尖的位置。
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