Pui Ching Middle School and Tsinghua University-Affiliated Primary School became sister schools today.  Principal Kou Kam Fai and Principal Dou Gui Mei both expressed their visions on future cooperation.  Ms. Si Hong Ping was invited to conduct a reading class for the students of Tsinghua University-Affiliated Primary School.  8 students from Pui Ching Middle School will be studying and joining various activities with fellow students from their sister school for the next two days.  The students will also be visiting the China Science and Technology Museum, the Beijing Science Center and the Beijing Planetarium together to learn about the history and technology of China.