Kev tsim cov txheej txheem ua luam dej auxiliary khoom

1. Cov qauv siv hluav taws xob muaj feem xyuam nrog kev ua haujlwm ntawm cov cuab yeej ua luam dej, tshwj xeeb tshaj yog rau cov khoom siv ua luam dej.

Cov txheej txheem hauv qab:

2. Swimming is a person who floats upwards under the buoyancy of water, and moves regularly through his limbs by virtue of buoyancy. When novices learn to swim, they generally use a swimming ring. The swimming ring is similar to a lifebuoy and is used in the water. Full of air, the swimming ring has buoyancy. It's all air inside. The swimming ring can be used to assist in learning to swim without sinking people. However, the existing swimming ring is not suitable for everyone, and when the existing swimming ring is damaged and leaks, the buoyancy is reduced, so that the user cannot be kept floating, which is likely to cause danger to the user.

Thov hu rau peb ntawm zhang@pride-cnc.com