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Apple CEO Tim Cook delivered MIT’s 2017 commencement address this morning (June 9) to g...

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1 Something is true according to a particular person, book, or other source of informat...

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1 One thing is above another 前者高于后者或在后者的上方。 用在附加状语里或动词 be 之后： Above the town, the fire...

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1 To write, talk, think, or have feelings about a particular thing 有关（想起某事、洽谈某事或对某事的感受...

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aboard a ship, aircraft, or spacecraft在船上、机上或宇宙飞船里。 用在附加状语里或动词 be 之后： I came aboard the...

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英语有100多个介词。这与英语里的名词、形容词和动词的数量相比，要小得多。人们使用的绝大多数句子里至少存在一个介词。在10个最常见的英语词中，介词就占3个：of，to，in。...

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Chapter 1 Introduction Economics Economics is the study of decision making in the pres...