线上教育（Distance education）
疫情加速了线上教育的起飞，在线下培训机构全部关停时，线上教育如火如荼。就连在学校教育领域，学生和老师在疫情期间都不得不开始适应直播课的形式。越来越多的学生开始接受这样的授课形式。可以从三方面来展开这个话题，
1. 线上教育实施的可能性
互联网的普及让线上教育成为可能。
互联网普及率 Internet penetration rate
远程通信 telecommunication
4G 信号基站 4G signal base station
2. 线上教育的优势
线上教育摆脱了时间和空间的限制，让学生更容易接触到更优质的教育资源。
They can get a much broader array of course choices, most of which offer superior instruction with much more flexibility: you can view the lectures when you want, as many times as you want, wherever you want. (the Economist 2014.2)
大多数课程都能提供更好的指导，而且灵活性更强，你可以在任何时间，任何地点，反复学习课程。
3. 线上教育潜在的隐患
线上教育会加剧教育不公平。
教育不公平 educational gap
有些学生会买不起设备和课程。
The poorest kids don’t have laptops or internet connections.
家境差的学生无法拥有好的学习环境。
Try it in a tiny, impoverished flat with no outdoor space, nowhere to go, no one to see and nothing to do, with the guilt of the god-awful slides on Google Classroom hanging over you.（the Spectator, 2020.6）
线下教学有线上教育不可取代的魅力，老师们可以实体课堂上调动学生的热情，激发他们的灵感。
There is an irreplaceable magic in a live lesson, with its ability to motivate, cheer and inspire.
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