慢速英语:越南将贸易协定视为建设经济的途径

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class –n. a group of people in a society who are at the same economic and social level

bid –v. to make an offer to pay a certain amount or to do work for a certain amount of money

intellectual property –n. something such as an idea, invention or process that comes from a person's mind

momentum –n. the force that something has when it is moving