To be engaging with your audience you have to be free to walk among them if you can, or at least vary your position on stage, so that you will appear to be approachable to everyone in the room.
要想与观众营造融洽的氛围,你可以走到观众中间与观众互动,最起码你得经常更换你在讲台上的位置。这样观众才会觉得你平易近人。