a moving target的用法和样例：
- The distance aimed in front of a moving target.
- For one thing, I think it is a moving target.
- Because, son, it is more difficult to hit a moving target.
- We've succeeded by being a moving target, by hitting them where they ain't.
- The exact number is still a moving target, but it will be dramatic’.
- For years he has made a practice of sleeping in a different bed each night, thinking a moving target is harder to hit.