The bicycle is one of the most important vehicles in the world.
自行车是世界上最重要的交通工具之一。
In every country people use bicycles for work, for sport or just for fun.
在每个国家，人们都用自行车上班、锻炼或者只是为了玩。
Bicycle riding is good exercise.
骑自行车是很好的运动。
It helps people become fit.
它让人们变得更健康。
Bicycle riding can make the riders' hearts and lungs strong.
骑自行车能够让骑手的心脏和肺部变得更强。
It is also good for the environment because bicycles do not cause pollution.
它对环境也有好处，因为自行车不会带来污染。
Bicycles share the road with cars and trucks.
自行车和轿车、卡车走相同的路。
Drivers do not always notice bicycles.
司机们通常不会注意到自行车。
So bicycle riders must pay attention to the traffic around them and know traffic signals.
所以自行车骑手一定要注意周围的交通环境和交通信号灯。
They must know and obey the safety rules.
他们一定要了解并遵守安全规则。
They must wear helmets to protect their heads.
他们必须戴头盔以确保自己头部的安全。
When riding at night, they must wear light-colored clothes, and have lights in the front and reflectors on the back of their bicycles.
晚上骑车的时候，一定要穿浅色的衣服，并且在自行车前面装上车灯，后面要有反光片。
An accident on a bicycle may be serious.
自行车发生事故会很严重。
In case of an accident, bicycle riders should know how to give first aid.
为了以防万一，自行车骑手需要知道如何进行急救。
If an injury is serious, they must call 120 for help.
如果受伤很严重，一定要打120求救。
In a word, the best way to be safe is to be careful.
总之，确保安全最好的方式就是小心。
