This is the principal function of language.

这是语言的最基本的功能.

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The transport of fat from the gastrointestinal tract is the principal function of this system.

运输胃肠道的脂肪物质是这个系统最主要的功能.

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Its function – perhaps even its principal function – is as a repository for myths.

它的作用——甚至是主要作用——是汇聚传奇.

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