20170324: announcement

03/24/17: Important announcement and clarification
In the future, I might skip most (not all) videos that only feature the function of "listening" unless they also contain certain training tips or practices (or other functions) because most teaching videos embedded here are spoken in English and therefore already require listening participations. I'm sorry (I don't mean to be rude) but I really have very limited time and energy while there're so many web-chores and daily editing routines to take care of.