I just rechecked the video again.It seems there is a third commentor in that video,but he seems to speak just a few words and he is not been introduced to the video viewers in any form,so that made me assume all the time there are just two commenters' voices there,but during my rechecking again just now,I kinda discerned a third male commenter's voice,which, to my ears, is very similar to one of the two formally introduced commenter's voice.If the finding of my rechecking just now proves to be right,then all the abovementioned several factors made this difficulty about the word "rich" for me.Really unexpected!Thank all you guys for your kind help!By the way,I still hope my finding can be proved to be right in any way.