求翻译：以美国证券化市场所占份额最大的品种—住房抵押贷款证券为例，充分发达的住房抵押贷款一级市场为其证券化的迅速发展奠定了坚实的基础。是什么意思？

U.S. securitization market share of the largest species - mortgage-backed securities, for example, fully developed housing mortgage market has laid a solid foundation for the rapid development of the securitization.

In the United States Securities markets, accounting for the largest shares of the species - mortgage securities as an example, fully developed mortgage market level for its rapid development of the securitization has laid a solid foundation.

Occupies the share biggest variety - housing mortgage loan negotiable securities take the American securitization market as the example, the full developed housing mortgage loan level market has laid the solid foundation for its securitization rapid development.

United States accounted for the largest share of the stock market-the case of mortgage-backed securities, fully developed the securitization of housing mortgage loan market for its rapid development has laid a solid foundation.

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