In India, there is an association between caste and the idea of pollution.

在印度，种姓和污染的概念之间存在着一种联系。

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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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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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As an example, they point to the emergence of a small but growing class of Dalit (formerly known as untouchables, the lowest in India's wretched caste hierarchy) millionaires.

BBC: Caste and entrepreneurship in India