After I had a chance to study abroad, I started to think that maybe my audience was not all Chinese; or maybe I might share my notes with my foreign friends in some days. Therefore, I should try to make my notes written in the most universal language - English.
For this reason, I installed the plugin
Ploylang and turned it as multilingual site. I will try to publish one note in two languages, and hoping my site being beneficial to every audiance around the globe.