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GUO CHENG GUANG (11 years old, Primary 5 from YUMIN Primary School)
GUO CHENGXI( 8 years old, Primary 2 from YUMIN Primary School)
Lessons In Mathematics and Science (Physics, Chemistry and Biology) From Primary to University Presented By Guo Cheng Guang and Guo Chengxi In English. Your comment or suggestion is very much appreciated.