Fourth grade in elementary school, I participated in a national essay contest for primary and secondary school students.

上小学四年级时，我参加了全国小学生作文竞赛。

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Secondary school teachers help students delve more deeply into subjects introduced in elementary school and expose them to more information about the world.

中学老师帮助学生更深入地钻研在小学中介绍的各个学科，并为他们提供关于这个世界更多的信息。

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Secondary school teachers help students delve more deeply into subjects introduced in elementary school and expose them to more information about the world.

中学老师帮助学生更深入地钻研在小学中介绍的各个学科，并为他们提供关于这个世界更多的信息。

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