Háizi men dài zhe xiàngpíquān zài yóuyǒngchí lǐ wán.
The children played in the pool with their swim rings.
Tips
usage
橡皮圈 covers two things: (1) a small elastic band for tying hair / bundling things, and (2) an inflatable rubber ring for swimming. Context disambiguates. The common 'rubber band' synonym is 皮筋 (píjīn) in colloquial speech.
