求翻译：美国1970年代开始相继通过了一系列有关资产证券化的法律，并多次修订了相应的税务法则、会计准则，为证券化的发展扫除了障碍。是什么意思？

The United States since the 1970s have passed a series of asset securitization laws, and repeatedly revised the tax law, accounting standards, remove obstacles for the development of securitization.

The United States began in the 1970s have led to the adoption of the A series of related asset securitization law has been amended several times, and the tax laws and accounting rules for securities, clearing the way for development.

正在翻译，请等待...

United States 1970 began successively adopted a series of laws related to asset securitization, and amended several times until the corresponding tax laws, accounting standards, and to remove obstacles to the development of securitization.

The American 1970 ages started one after another to pass a series of related property securitization law, and have revised the corresponding tax affairs principle, accountant many times the criterion, cleaned the barrier for the securitization development.