高二英语知识点Unit 8 First aid

　　1. don't have to (do sth.) (不必干某事)

　　2. lay, lie的用法

　　3. fall off (跌倒; 减少)

　　4. knock off (one's feet) (把...击倒)

　　5. deal with (对付; 处理)

　　6. throw up (呕吐)

　　7. mouth-to-mouth (嘴对嘴)

　　8. out of one's reach (够不着)

　　9. ought to (应该)

　　10. pay attention to (注意)

　　11. take it easy (别紧张)

　　12. by mistake (弄误会)

　　13. hold up (举起)