目的:探讨学龄前儿童屈光不正的一般规律。
The principle of comparative advantage is a general law in economic operation.比较优势原理是经济运行中的普遍规律。
But it must obey the general law of the civil action taking litigants ight of action as the basis of procedure construction.但是它必须遵循民事诉讼的一般规律,以诉权为程序建构的基础。