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10. the elderly = the aged = the old老年人

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9. make an effort to do 做出努力去做   spare no efforts to do 不遗余力去干…

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8. be of no effect  无效       side effect  副作用

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7. come into effect 开始生效 (come into force)   bring sth.  into effect  实施 

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6. have an effect on 对…影响   produce an effect of (doing) sty 产生…效果

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5. economy class 经济舱  national economy 国民经济

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4. economic development  economical 节俭的,节约的  an economical car to run  节油汽车

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3. eat one's words = break one's promise 食言 

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2. take it easy 别着急    

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1. in the east of (在里面)  to the east of  不连接)  on the east of (接攘)

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