translation.en: Not in an envelope of a human arm, with 21 degrees of freedom, from your shoulder to your fingertips." He said, "About two dozen of these 1,600 kids have come back bilateral.
translation.zh: 这是人类胳膊可抓取的范围". 他说:"在这一千六百些幼童以内有差不多二十四位双臂截肢的人.