This book treats of the caste system in India.

这本书论述了印度的种姓制度。

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A caste system consists of ranked groups, each with a different economic specialization.

种姓制度由等级群体组成，每个群体具有不同的经济专业化。

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There is also an association between food prohibitions and rank, which is found in its most extreme form in the caste system of India.

食物禁忌和等级之间也有联系，这在印度的种姓制度中表现得最为苛刻。

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They are reinforced by a Hindu caste-system perhaps even more entrenched than that in India, and by the discrimination long suffered by the Madhesi people of the lowland plains neighbouring India.

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