Students holding greeting boards and a teacher dressed in cartoon character of ox greet students at a primary school in Hefei, capital of east China's Anhui Province, Feb. 22, 2021. Middle and primary schools in Hefei greeted new semester on Monday. (Xinhua/Du Yu)

Students holding greeting boards and a teacher dressed in cartoon character of ox greet students at a primary school in Hefei, capital of east China's Anhui Province, Feb. 22, 2021. Middle and primary schools in Hefei greeted new semester on Monday. (Xinhua/Du Yu)

Students holding greeting boards and a teacher dressed in cartoon character of ox greet students at a primary school in Hefei, capital of east China's Anhui Province, Feb. 22, 2021. Middle and primary schools in Hefei greeted new semester on Monday. (Xinhua/Du Yu)

Students show their holiday extracurricular creations at a primary school in Hefei, capital of east China's Anhui Province, Feb. 22, 2021. Middle and primary schools in Hefei greeted new semester on Monday. (Xinhua/Du Yu)

A teacher dressed in cartoon character of ox greets students at a primary school in Hefei, capital of east China's Anhui Province, Feb. 22, 2021. Middle and primary schools in Hefei greeted new semester on Monday. (Xinhua/Du Yu)