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1.refer to 指的是
例句：He never referred to his sisters in his letters.
他在信里从未提到过他的姊妹。
2.lower extremity 下肢
例句：Factors that cause patellofemoral pain include: over use, soft tissue imbalance, and malalignment of lower extremity.
造成髌股关节痛的原因主要有过度使用、软组织不平衡、下肢骨骼排列不正确。
3.lie down 躺下
例句：He went to lie down after a long journey.
在长途旅行以后，他躺上床休息了。
4.pins and needles 刺痛感
例句：I have pins and needles in my right arm.
我右手臂有刺痛感。
