慢速英语:美国农民希望从北美自由贸易协定中获得经济效益

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game – n. a physical or mental activity; a field of gainful activity

cheaper – adj. costing less; not costing a lot of money

uncertainty – n. the state of being unsure; something that is unknown

rhetoric – n. the art of speaking or writing effectively

achievement – n. a result gained by work or effort