请教个中美专利权期限问题

U.S.C. 154Contents and term of patent; provisional rights. (2)TERM.—Subject to the payment of fees under this title, such grant shall be for a term beginning on the date on which the patent issues and ending 20 years from the date on which the application for the patent was filed in the United States or, if the application contains a specific reference to an earlier filed application or applications under section 120, 121, or 365(c) of this title, from the date on which the earliest such application was filed. (3)PRIORITY.—Priority under section 119, 365(a), or 365(b) of this title shall not be taken into account in determining the term of a patent. 中国专利权20年从申请日起算，这个申请日应该是指实际的国家专利行政部门收到申请文件的日期吧（不管本国优先权和外国优先权）。上面的美国专利权也是从申请日起算，但是要求本国优先权的从优先权日起算，要求外国优先权的仍然以实际申请日起算。不知道理解的对不对，最近在学习美国专利法，英文水平一般般累死了