Elementary and secondary education, which forms public education, is free and compulsory.

初等和中等教育属公立教育，是免费和义务的。

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The duration of compulsory (elementary) education is from the age of 7 to 15.

强制性教育年限是7到15 岁。

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Elementary education is compulsory in almost every country in the world.

在全世界几乎所有的国家中，小学教育都是义务的。

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According to Article 26 of the Universal Declaration of Human Rights, that right includes free and compulsory elementary education, and access to technical, professional, and higher education.

FORBES: Bill Gates