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If you are not sure, you can ask like this :
“ Is it a…? ”
“ Are they…? ”
truck n.
reflector n.反光镜,玻璃
If you ride a bike at night,
you must have
a reflector on the back of your bike.
traffic signals n.信号
If you are a bicycle rider(骑车者),
you must pay attention to the traffic signals .
care for，注意
give first aid 急救
/eid/
If you are a doctor, you must know
how to give first aid.
In case of an accident, we should know
how to give first aid, too.
如果，假使
safe(adj.)
→ safety n. 安全,平安
safety rules 安全规则
obey the safety rules.
If you are a bicycle rider(骑车者), you must
notice v.
注意到
↙
injury n. (对躯体的)伤害，损伤
If an injury is serious(严重的）, you must
call 120 for help.