know one's distance

例句：

1. 1. I know the answer to this question.
   我知道这个问题的答案。
2. 2. She knows how to fix cars.
   她知道如何修车。
3. 3.We need to know more about the situation before we make a decision.
   在做出决定之前，我们需要更多地了解情况。