慢速英语:US Gives Less Foreign Aid than Americans Think

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billion – n. the number 1,000,000,000 : one thousand million

trillion – n. the number 1,000,000,000,000 : one thousand billion

effective – adj. producing a result that is wanted : having an intended effect

afford – v. to be able to pay for something

advance – v. to move forward

displace – v. to take the job or position of (someone or something

alternative – n. something that can be chosen instead of something else