There are three main types of contract(s).

有三种主要的合同。

《牛津词典》

There are three main types of contract.

有三种主要的合同。

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Every single one of those types in the hierarchy has a contract.

类层次结构中的每一类型都具有一定的契约关系。

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Every single one of those types in the hierarchy has a contract.

类层次结构中的每一类型都具有一定的契约关系。

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