Construction of such approaches solutions, people have developed many effective methods, such as asymptotic matching, averaging, multiple scales, stretched coordinate and WKB methods.

• 为构造这样的渐近解,人们先后发展了很多有效的方法,如匹配渐近展开法、平均法、多重尺度法、伸缩坐标法和WKB方法等。