reteach       
verb [ T ] (also re-teach) uk/ˌriːˈtiːtʃ/  reteaching | retaught
 重新讲授
to teach someone something again
  Ideally, we'd have smaller classes grouped by ability, so teachers could slow down and re-teach difficult material. 理想情况下,我们会根据能力分组进行小班授课,这样老师们就可以放慢速度,重新教授讲授材料的困难部分。 
 I've been reteaching myself to knit properly, and I must admit that my knitting looks more professional now.
 - More examples
 - As a teacher, it's difficult to have to reteach what you've just taught because some students weren't paying attention.
 - All school staff intervene daily to teach, re-teach and reinforce the appropriate conduct of our students through discussions.
 - If necessary, re-teach the patient to comb their hair, dress, and wash themselves.