Plural main body, rich content and the participation non-compulsory are its main characteristics.

主体的多元性、内容的丰富性、参与的非强制性是它的主要特点。

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During this period, the curriculum setup in middle schools was continuously adjusted, which was best reflected by the systems such as the department instruction and non-compulsory course system.

这一时期中学教育的课程设置不断变化，主要体现在中学的分科教学、选科制与学分制等方面。

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Efforts will also be made to expand the development of tourism and community services, the industrialization of culture and physical education, non-compulsory education and non-basic medical care.

扩大旅游和社区服务，推进文化体育、非义务教育、非基本医疗保健的产业化。

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This sets a non-compulsory emission level, but allows city authorities to order offending facilities to make improvements.

CNN: Warning -- this garbage is dangerous

The study said the government's decision to make languages non-compulsory for pupils over 14 was having an adverse effect.

BBC: NEWS | UK | Education | Big fall in university languages

In March, Education Minister Liz Truss announced PSHE would remain a non-compulsory subject, saying it should be down to schools and teachers to decide on the topics covered in lessons.

BBC: Poor sex education leaves pupils vulnerable - Ofsted