The choice of Chemistry activity-class content should be accordance with the principle of interest, rationality, extract and localization.
化学活动课内容的选择，要符合趣味性、合理性、精辟性和地方性原则。
It is important to improve the level of the management , form and content of physical activity after class. It could increase quality of physical activity after class.
只有不断加强课外体育活动的组织管理、改善形式、内容等，才能有效地提高课外体育活动的质量。
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