The fundamental difficulty with XML documents is checking their internal validity (cohesion of document logic).
使用XML文档的主要困难在于检查其内部有效性(文档逻辑的内聚性)。
It follows from the principle of relativity that Newton's second law of motion, although fundamental in classical mechanics, only has an approximate and by no means complete validity.
由相对论原理可知，牛顿运动第二定律尽管是古典力学中的基本原理，但只是近似的，而绝不是完全正确的。
It follows from the principle of relativity that Newton's second law of motion although fundamental in classical mechanics only has an approximate and by no means complete validity.
由相对论原理可知，牛顿运动第二定律尽管是古典力学中的基本原理，但只是近似的，而决不是完全正确的。
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