free-swimming

例句：

1. 1. He enjoys free-swimming in the ocean during his vacation.
   他在假期里喜欢在海里自由游泳。
2. 2.The children are learning to free-swimming at the local pool.
   孩子们正在当地的游泳池学习自由泳。
3. 3.Free-swimming is a great way to exercise and stay fit.
   自由泳是一种很好的锻炼方式，可以保持身体健康。