An injury ended Zhang Zhiqiangs dream of becoming a professional basketball player, so he became a physical education teacher. To impress the new young math teacher, he volunteers to teach the problem class of the school in math.
1987
2006
1975
1997
2002
2003
1930
1952
1961
1978
1958
1956
2011
1993
1938
1951
1985
1996
