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浅色的、淡色的
passenger
crazy
anywhere
pollution
advantage
rider
careless
helmet
light-colored
learn the new words and phrases
truck n.
reflector n.
injury n. (对躯体的)伤害，损伤
signal n.信号，暗号
notice n. 注意，理会；v.看到，注意到
in case of 如果，假使
look out 小心(be careful)
in a word 总之
safety n.安全，平安
/′seifti/
first aid 急救
pay attention to 注意
How to keep safe when riding.
1.We must be careful.
2.We should never ride too fast.
3.We should wear bicycle helmets.
4.We must obey the traffic rulers.
5.We must drive on the left-hand side of the road.
6.We should have lights on the bicycle or wear light-colored clothes at night.