The bicycle is one of the most important vehicles in the world. In every country, people use bicycles for work, for sport or just for fun.
Bicycle riding is good exercise. It helps people become fit. Bicycle riding can make the riders’ hearts and lungs strong. It is also good for the environment because bicycles do not cause pollution.
Bicycles share the road with share sth. with sb. : 与某人分享某物 cars and trucks truck: US: [trʌk] UK: [trʌk] n. 【汽】卡车；拖车；货运车厢. Drivers do not always notice notice: US: [ˈnoʊtɪs] UK: [ˈnəʊtɪs] n. 注意；通知；通告；布告 v. 注意；留意；意识到；注意到 bicycles. So bicycle riders must pay attention to pay attention to: 重视；对……注意 the traffic around them and know traffic signals signal: US: [ˈsɪɡnəl] UK: [ˈsɪɡn(ə)l] n. 信号；信号灯；标志；预示. They must know and obey the safety safety: US: [ˈseɪfti] UK: [‘seɪfti] n. 安全；安全性；平安 rules obey the safety rules: 遵守安全规则. They must wear helmets to protect their heads. When riding at night, they must wear light-colored clothes, and have lights in the front and reflectors reflector: US: [rɪˈflektər] UK: [rɪˈflektə(r)] n. 反光面；（夜间光线照射后能反光的）反光玻璃（或塑料） on the back of their bicycles. A bicycle accident may be serious. In case case: US: [keɪs] UK: [keɪs] n. 病例；实例；箱；事例 of in case of: 要是；万一；假使；如果 an accident, bicycle riders should know how to give first aid first aid: 急救. If an injury injury: US: [ˈɪndʒəri] UK: [‘ɪndʒəri] n. 损伤；挫伤 is serious, they must call 120 for help. In a word in a word: 总之；简言之, the best way to be safe is to be careful.
|↑1||share sth. with sb. : 与某人分享某物|
|↑2||truck: US: [trʌk] UK: [trʌk] n. 【汽】卡车；拖车；货运车厢|
|↑3||notice: US: [ˈnoʊtɪs] UK: [ˈnəʊtɪs] n. 注意；通知；通告；布告 v. 注意；留意；意识到；注意到|
|↑4||pay attention to: 重视；对……注意|
|↑5||signal: US: [ˈsɪɡnəl] UK: [ˈsɪɡn(ə)l] n. 信号；信号灯；标志；预示|
|↑6||safety: US: [ˈseɪfti] UK: [‘seɪfti] n. 安全；安全性；平安|
|↑7||obey the safety rules: 遵守安全规则|
|↑8||reflector: US: [rɪˈflektər] UK: [rɪˈflektə(r)] n. 反光面；（夜间光线照射后能反光的）反光玻璃（或塑料）|
|↑9||case: US: [keɪs] UK: [keɪs] n. 病例；实例；箱；事例|
|↑10||in case of: 要是；万一；假使；如果|
|↑11||first aid: 急救|
|↑12||injury: US: [ˈɪndʒəri] UK: [‘ɪndʒəri] n. 损伤；挫伤|
|↑13||in a word: 总之；简言之|