Ask clarification to reviewer of paper
If English is not your own first language, then you might first want to ask someone you know with "native" English skills to help interpret the review. 

Then ask the editor for clarification of the review, but be detailed about what parts of it you don't understand. Most editors will be willing to work with you, but I can't guarantee that all will. But if you don't ask you won't learn anything. 

And, it may take some time to resolve this. If the editor has doubts about the reviewer or the review they may ask for another, which adds to the time.