下水方知“深”与“浅”。教师写“下水文”，从一个侧面探测作文教学的“深”与“浅”，这对指导学生作文是极有帮助的。我认为，语文教师应写“下水文”。一、写“下水文”是提高教师自身素质的需要发展素质教育，首先强调的，应该是提高教师的自身素质。所谓“要给学生一滴 Sewage known “deep” and “shallow.” Teachers write “Hydrography”, which explores the “deep” and “superficial” of composition teaching from one aspect, which is very helpful to guide students' composition. In my opinion, language teachers should write “Hydrography.” First, to write “Hydrology” is to improve the quality of teachers need to develop quality education, the first emphasis should be to improve the quality of teachers themselves. The so-called "to give students a drop