He especially added a word in the article when describing the mutual equal of mass and energy that the saying of mutual equal was not accurate.
在表示质量和能量的互等性时，他在文章中特别加了一句话：互等性的说法不确切。
2
In it often accompany heat transfer, mass transfer, chemical reaction and phase change. Mutual interactions of mass, momentum, energy and heat among different phases are very complicated.
On the basis of above results, the mutual relationships among temperature, molten pool depth, mass transfer distance, parameters of the laser and properties of materials were carefully discussed.