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in the last three years可以是在指定的某一段时间里的最后三年或者是现在时间的前三年,可以是上世纪的最后三年:in the last three years of 20th century.或者06、07、08年。
而in the past three years只能是指现在时间的前三年,就是只有06、07、08这三年。
In the past three years, the phenomenon of increased rather than decreased enterprise work overtime. Global sporting goods giant Nike in
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