turn of the screw

例句：

1. 2.
   比喻
2. 3.
   比喻
3. 1. The engineer knew exactlywhat he needed to do to turn thescrew on the machine.
   工程师知道确切需要做什么来使机器运转。
4. 2. The company's performance turned aroundafter a series of successful marketingcampaigns.
   公司的业绩在一系列成功的营销活动之后开始好转。
5. 3. The solution to this problemis often the turning point in the story.
   这个问题的解决方案往往是故事中转折点。