systematic  carding,  this  study  can  help  researchers 
understand  the  types  and  research  status  of  online 
learning platforms, help teachers to correctly choose 
a  suitable  online  teaching  platform,  and  make 
rational  use  of  the  functions  of  the  platform  to 
achieve better teaching results. This paper also has 
some  limitations,  because  the  choice  of  literature 
retrieval websites is limited, and the research results 
are  only  produced  by  a  few  selected  keywords,  so 
some articles may not be included. It is hoped that 
in the future research, more reference papers could 
be  included  to  get  a  more  comprehensive  picture. 
Online  learning  is  developing  fast  worldwide, 
especially  after  the  appearance  of  COVID-19. 
Therefore it is hoped that the comparison of online 
learning research between China and abroad in this 
paper  could  help  to  reveal  the  advantages  and 
disadvantages  of  online  learning  development  in 
different  countries.  More  importantly,  this  paper 
could  provide  a  reference  for  the  research  and 
reform direction in the future.   
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