求翻译：西周而下的宗法血缘制度。宗法血缘制度的核心，即在于“嫡长子继承制”。由此一步步反推，即不得不有上述道德规定。此即是说，由“嫡长子继承制”的宗法血缘制，则同时在血缘与经济两方面有事实上的男尊女卑；即依此，出于道德秩序的考量，乃不得不提出女子的“三从四德”。是什么意思？

Zhou and blood under the patriarchal system. Patriarchal kinship system, the core, that is "entropy primogeniture." Thus step by step the inverse, that had to have the moral requirements. This means that by the "entropy primogeniture," the patriarchal kinship system, however, both the blood and the

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Western Zhou dynasty under the patriarchal system of blood. Core of the patriarchal system of blood, that is "legitimate eldest son". Reverse this step, that is, had to have that moral regulations. This means that, from "first the eldest" patriarchal consanguinity, consanguinity and at the same time