swim ring

例句：

1. 1. The kids were playingin the pool with their swim rings.
   孩子们在泳池里戴着游泳圈玩耍。
2. 2. Sheput her swim ring on and divedinto the water.
   她把游泳圈戴上，跳进水里。
3. 3. The swim ring wasa great way to keep the kids entertained while they learned to swim.
   游泳圈是让孩子们学会游泳时保持娱乐的好方法。