Chapter 13.5 translated
checkout from DiscoverMeteor_Kr
Part of chapter 14 translated
Part of chapter 14 translated
to avoid pull request fail
step by step to avoid pull request fail
roll back to previous state
chapter 14. step by step translation
chapter 14. translated step by step
chapter 14. translated step by step
chapter 14 translation done
chapter 9, 10, 13 refined some paragraphs
bug fixes