✔ 最佳答案
don't eat too much before swim
do warm up exercise before swim
be care of your belongings (avoid theft)
do not swim when red flag is suspended
follow the instructions of the safe guide
look after children under 10
don't swim if you have a wound or cut
Don't go to swim without your parents permission .
Before swimming , you have to do some warm-up exercises .
Do not eat too much food or drinks before swim .
Don't go to swim if you have a wound .
Don't go swimming in the morning or evening , it's dangerous