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The older readers were considerably more challenging and demanding than the new.
老读本比新读本更具挑战性,要求也远为严格.
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工业组态软件, 组态王中级培训教材. 内容很丰富哦.
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Sadly, there is little of this insight in textbooks of mathematics at all levels.
遗憾的是, 各种程度的数学教本都很少注意到这一点.
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