A student wearing a raincoat leaves a primary school in Huangpu District, east China's Shanghai, Sept. 13, 2021. Shanghai has ordered kindergartens, primary and high schools to suspend classes from Monday afternoon to Tuesday as the city braces for heavy rains and strong winds due to Typhoon Chanthu. [Photo by Liu Ying/Xinhua]

A staff member puts sand bags to reinforce flood defence at a primary school in Huangpu District, east China's Shanghai, Sept. 13, 2021. Shanghai has ordered kindergartens, primary and high schools to suspend classes from Monday afternoon to Tuesday as the city braces for heavy rains and strong winds due to Typhoon Chanthu. [Photo by Liu Ying/Xinhua]

A security staff member sends a student to the gate of a primary school in Huangpu District, east China's Shanghai, Sept. 13, 2021. Shanghai has ordered kindergartens, primary and high schools to suspend classes from Monday afternoon to Tuesday as the city braces for heavy rains and strong winds due to Typhoon Chanthu. [Photo by Liu Ying/Xinhua]

A teacher checks windows at a primary school in Huangpu District, east China's Shanghai, Sept. 13, 2021. Shanghai has ordered kindergartens, primary and high schools to suspend classes from Monday afternoon to Tuesday as the city braces for heavy rains and strong winds due to Typhoon Chanthu. [Photo by Liu Ying/Xinhua]

Students whose parents can not pick them up on time are taken care of by their teacher at the library of a primary school in Huangpu District, east China's Shanghai, Sept. 13, 2021. Shanghai has ordered kindergartens, primary and high schools to suspend classes from Monday afternoon to Tuesday as the city braces for heavy rains and strong winds due to Typhoon Chanthu. [Photo by Liu Ying/Xinhua]

Staff members carry pot plants indoor at a primary school in Huangpu District, east China's Shanghai, Sept. 13, 2021. Shanghai has ordered kindergartens, primary and high schools to suspend classes from Monday afternoon to Tuesday as the city braces for heavy rains and strong winds due to Typhoon Chanthu. [Photo by Liu Ying/Xinhua]

Students line up under the shelter of a removable awning after class at a primary school in Huangpu District, east China's Shanghai, Sept. 13, 2021. Shanghai has ordered kindergartens, primary and high schools to suspend classes from Monday afternoon to Tuesday as the city braces for heavy rains and strong winds due to Typhoon Chanthu. [Photo by Liu Ying/Xinhua]