1、不要独自去，要与同学一起去 Don't go alone,accompanied by some students with you.
2、饭后、饥饿时劳累时不要去游泳 Don't go swimming after dinner or when you are hugry
3、初学者要带游泳圈并注意使用 Take a lifebelt with you to go swimming if you are beginner
4、水深温度低时，不要在水中停留 Don't stay in the water that is too cold.