ring outside callipers 弹簧外卡钳
The researchers made photocopies of the palm of the children's hands and then measured the length of their index finger and ring finger on both hands using callipers, accurate to 0.01mm.
研究人员将孩子们的手掌影印下来，然后用卡钳测量食指和无名指的长度，精确到0.01 mm。
To calculate the key measurement Dr Manning recommends photocopying the right hand and measuring the length of the index finger and ring finger, using accurate callipers.
为了测量关键数据，曼宁教授建议把右手影印下来，用精确的千分尺测量食指和无名指的长度。
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