free swing period

例句：

1. 1.The free swing period is when the ball is in mid-air and the player can make a free throw.
   自由摆动期是球在空中时，球员可以自由投篮的时期。
2. 2.During the free swing period, the player has to be careful not to hit the ball with their hand.
   在自由摆动期，球员必须小心不要用手打球。
3. 3.The free swing period is crucial for players to practice their shooting skills.
   自由摆动期对于球员练习投篮技巧至关重要。