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　　【图片背景】

　　It was announced at the Hangzhou's education conference at the beginning of this year, under the premise that the total teaching hours are not changed for the academic year, Hangzhou middle and primary schools will adjust the time for Spring and Autumn Vacations as well as Winter and Summer Vacations on a trial basis.

　　【实用词汇】

　　under the premise 在此前提之下

　　total teaching hours 总学时

　　academic year 学年

　　on a trial basis 试行