全国大众英语80篇背诵阅读带翻译(八十) Evolution and Wheels In the past, evolutionary biologists contemplating the absence of wheels in nature agreed that the explanation was not undesirability: ... /
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大众英语80篇背诵阅读带翻译(五) "10 Types of Speech Standard usage includes those words and expressions understood, used, and accepted by a majority of the speakers of a language in any situati... /
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