There is air in the balloon, so what's in the swimming ring? Give (someone) a brain teaser.

It's popularity, and swimming rings are balloons. People must be in the swimming ring, and the swimming ring is also alive. So it is popularity.

Swimming rings are similar to lifebuoys and are used in water. Blow, and the swimming ring will have buoyancy. It is full of air. Wrap it around your waist and jump into the water. Swimming rings can be used to help learn to swim. There is also a saying that the swimming ring refers to the belly and describes people as fat.

Extended data:

Brainstorming originated in ancient India. Brainstorming is a series of complete comic jokes published by the culture of the times on 1989 12.06, which changed from the comic question on the previous page to the unexpected answer after flipping through it. At that time, there was a social craze in Taiwan Province Province, and all the streets and alleys were asking each other brain teasers, which evolved into a pattern of cold jokes and was later introduced to Chinese mainland.

Brainstorming has a wide range of categories, including classics, puzzles, jokes, satire, mathematics, adults, English, all mankind, cold jokes and so on.