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4. The period (give) dance classes increases gradually from two or three hours a day to five or six.
4. given to 此处given to dance classes为过去分词短语作后置定语'相当于that was given to dance classes,意思是"分给舞蹈课的时段"。
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4. The period (give) dance classes increases gradually from two or three hours a day to five or six.
4. given to 此处given to dance classes为过去分词短语作后置定语'相当于that was given to dance classes,意思是"分给舞蹈课的时段"。