4000 Duolingo Vocabulary List

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n. 经济学 branch of social science that deals with the production and consumption and their management

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n. 效力 efficiency; quality of being effective

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n. 肘 hinge joint between the forearm and upper arm

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ad. 不断地,无穷尽地 in an endless manner

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a. 精力充沛的,积极的 active; vigorous;  having or involving a lot of energy  

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n. 传染病,流行病 the outbreak of a contagious disease that spreads rapidly and widely; widely prevalent

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n. 发展,演变 development; a gradual process of change and development

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v. 胜过,杰出 be superior; distinguish oneself

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n. 复制品 exact copy or reproduction, as of a document; fax

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n. 闪光,闪现 emit a brief burst of light; appear briefly; a sudden intense burst of radiant energy