[InKunming--Yunnan]  A soldier washes the muddy ground at the prefabricated school for students to have a clean campus in quake-hit Longtoushan Town of Ludian County, southwest China's Yunnan Province, Sept. 8, 2014. (Xinhua/Hu Chao)

A soldier sprays disinfectant at the prefabricated school for students to have a clean campus in quake-hit Longtoushan Town of Ludian County, southwest China's Yunnan Province, Sept. 8, 2014. (Xinhua/Hu Chao)

A soldier sprays disinfectant at the prefabricated school for students to have a clean campus in quake-hit Longtoushan Town of Ludian County, southwest China's Yunnan Province, Sept. 8, 2014. (Xinhua/Hu Chao)

Soldiers clean the wall at the prefabricated school for students to have a clean campus in quake-hit Longtoushan Town of Ludian County, southwest China's Yunnan Province, Sept. 8, 2014. (Xinhua/Hu Chao)