Hong Kong has about forty public(公共的) beaches. Some of the beaches are the best in the world. People can gothere for a swim. You can go to most of them by bus. To go to some beaches you must take a boat. There are toilets,changing rooms and places to buy food and drink on most of the beaches. You will swim there without danger if you remember these instructions(说明): 1.Never swim alone. 2.Never swim after a meal or when you feel hungry or tired. 3.Do not stay in the water too long. 4.Never go out in a boat if you cannot swim. Remember : A red flag(旗帜) means that it is dangerous for anybody to go into the water. A blue flag means that it is dangerous for children