There is a dictionary specializing in selling four-level words; Some apps, such as scallop words, fluent speaking and Netease etc CET-4, are short for CET-4, which is a national English test sponsored by the Higher Education Department of the Ministry of Education. The main target of the examination is college students, undergraduates or graduate students who have completed the CET-4 according to the educational syllabus. Standardized grades 4 and 6 were prepared at the end of 1986 and formally implemented at 1987.