screw

• A feed screw extends from the base to the knee .
  进给丝杠从底座伸向升降台。
• The top is turning like a screw .
  那顶端象螺丝一样地旋转着。
• The man screwed up his eyes and studied us .
  那人眯起眼睛，仔细地打量着我们。
• You and your people really screwed up today !
  你和你的人今天确实把事情搞糟了。
• A screw has started. tighten it .
  一个螺丝松了，把它拧紧。
• I spent some minutes screwing up my courage .
  我花了几分钟时间来振作我的胆量。
• I am screwed down by fixed rules .
  我被清规戒律束缚住了。
• The adjusting screw rests on the high step of the cam .
  调节螺钉落在凸轮高点上。
• I was trying to help , but i screwed up again .
  我原想帮忙，反而又把事情搞糟了。