This note is a revisiting Quillen's note [3] "Modules theory over non-unital rings" in category theory language. Faltings [1]; Gabber and Ramero [2] established almost mathematics which is the same as Quillen's bilocalization of a category of modules by almost zero objects.

This paper describes online Chinese language learning practice in cooperation with other technical colleges and overseas partner universities from August 24 to September 30, 2020. In this initiative, students watched the videos for class preparation in advance and learned the contents of the videos practically online from the students of the Applied Chinese Department of Wenzao Ursuline University of Languages (WZU) in Taiwan. Since 2015, National Institute of Technology, Ube College has accepted students from the Department of Chinese Language and Literature of National United University (NUU) in Taiwan as Chinese language trainees every year. The trainees provide support to the teachers in charge of Chinese classes and conduct the classes themselves. However, in 2020, due to the pandemic caused by the coronavirus pandemic, we will no longer be able to accept Taiwanese interns. So, instead, we had students from WZU conduct one-on-one Chinese classes online. As a result of the 26 classes given by WZU of Foreign Studies students for about one month, the Japanese students' ability to understand Chinese improved compared to previous years, especially in pronunciation. An evaluation questionnaire shows that the classes were significant for both students. This paper will explain the process leading up to the implementation of the online class, class implementation, and the innovations in the class. Finally, this paper will discuss the points for reflection and future issues.