In the spring of 2020, a sudden epidemic broke people's normal lives, affected the production and operation of various enterprises, and severely affected the normal teaching arrangements and order of schools at all levels, including large, middle and elementary schools. The Ministry of Education issued a notice to postpone the start of the spring school, and advocated the use of online platforms to launch "no suspension of classes". So far, online teaching has once again entered the public's field of vision.
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