This study refers to the circular teaching theory proposed by a Russian linguist,whose theory applies the mathematics concept of concentric circle to language teaching,through which teaching process is made step by step,focusing on the basic culture topics.

This paper mainly analyzes the network teacher should take the different roles and thoroughly improve the student s ability of using English according to the different teaching periods.

Comparative Analysis of Circumference Control System in Filter Rod Maker;

Research on English Character Recognition Method Based on Center and Circumference;

Bamboo strip unfolding rate of onefourth circumference is 99% and that of one-third is 52% (the top of bamboo culm being 8%,the middle 75% and the bottom 72% ), but bamboo strips with 5/12 circumference are allbroken.