Help Center>Sound Effect Help>You hear echoes

This is probably caused by the other students’ equipments. The possible causes are:
①、 Some other students are having the class with their sound boxes on. They should have used headsets.
②、 There is some problem with the other students’ headsets which need to be repaired or changed.
③、 You as well as the other students need to modify the original settings of this page. Do as follows:

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