Calculus of Elementary Functions - A Prefer Option for Textbooks of High School

How to teach calculus in high school? This topic has always been a controversial question, and it is even called "math wars" by some experts. Quiz Lin and Jingzhong Zhang, et.al have made many efforts in this area since 1997. They have published a series of books on calculus, and wrote several blogs online. I think that their calculus of elementary functions is a prefer option for textbooks of high school by considering domestic and international issues and controversy of teaching Calculus, because these so many problems could be solved if high school students learn calculus of elementaiy functions. The calculus of elementaiy functions is neither "simply lowered" from university calculus course, nor "grab the runway" with college calculus course, which truly has independent content of course, systematic knowledge structure, enlightening language, good linkage with university calculus, and has widely real-word application in various fields.