The tensor products of double-symmetric coalgebras and the dual relationships between double-symmetric algebras and double-symmetric coalgebras are discussed.

通过研究双对称代数的对偶结构，主要讨论双对称余代数的张量积及双对称代数和双对称余代数之间的对偶关系。

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Double lives and dual identities are common for both the women and men involved in sugar relationships.

对于“糖爹”关系中的男女双方来说，双重的生活与双重的身份都很常见。

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Theories of the specific legal relationships mainly include administrative legal relationships, civil contract legal relationships and dual legal relationships.

关于这一特定法律关系的理论主要有行政法律关系、民事合同法律关系、双重法律关系。

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The senior women were more often in dual-earner relationships, whereas the men were three times more likely to have an unemployed spouse.

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