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疫情下网课这样上：ppt和手写同时呈现，还原教室上课场景！
没有买数位板没有办法手写？鼠标写字太丑？总是需要在PPT播放和摄像头画面之间来回切换？以上问题1台电脑+1部手机全部解决！
网课教学技巧——小白也能学会哦10/23
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