a grab start的用法和样例：
- The competitors grasp the front edge of the platform. It's called a grab start.
- The boy made a grab at the frog, but it jumped away.
- The thief made a grab at my bag but I pushed him away.
- The boy made a grab at the frog,but it jumped away.
- He offered a grab bag of reasons for his decision.
- He made a grab for David's gun, which was an error.
a grab start的相关资料：