There is a famous saying goes like that “Knowledge is a treasure, but practice is the key to it.” This saying shows the relationship between knowledge and practice vividly. As far as we know, if we don’t have corresponding knowledge of some fields, we cannot do well in the fields. There are innumerable examples to illustrate this point. For instance, a singer can sing well only if he or she possesses musical knowledge; a dancer can dance well only if he or she knows how to dance; a worker can...