I was going to make a purpose of this blog the blog which translated my other blog into English and Chinese.
However, as a result of having given priority to other things, it became troublesome.
Besides, I decided to withdraw from the space that I borrowed to write this blog.
By the end of April, 2020, I withdraw.
Other articles delete it on December 31, 2019.
Thus, this blog completely disappears by the end of April, 2020.
Sorry, thank you for your understanding.