a hamstring injury的用法和样例：
- Mussina, like Hughes, knows firsthand the frustration of a hamstring injury.
- Mads Timm is back with United after suffering a hamstring injury in his final game with relegated Walsall.
- And aside from the devastating loss of rookie pitcher Phil Hughes to a hamstring injury Tuesday, nobody else was hurt in a freaky mishap this week.
- Wang, making only his second start after his own DL stint with a hamstring injury, looked to still be shaking off some rust.
- Flamini hobbled off with a hamstring injury during the Champions League Semi-Final second leg.