Important and difficult teaching points 教学重难点 ; 教学重

Teaching important and difficult points 教学重难点 ; 教学重点和难点 ; 教学重点与难点

Teaching difficult and important points 教学重点与难点

Difficult points of Teaching 教学难点

TEACHING KEY AND DIFFICULT POINTS 教学重点和难点 ; 教学重难点

Teaching important & difficult points 教学重难点

Teaching key & Difficult points 重点和难点

Teaching focal and difficult points 教学重点难点

Teaching Difficult Points 教学难点