Students of Dajia Elementary School enjoy their lunch in Taipei, southeast China's Taiwan, Nov. 29, 2012. Food metarials are purchased through bidding in order to make sure of the nutrition, low price and taste of lunch for students. (Xinhua/Xing Guangli)

A worker washes fruits at the dining hall of Dajia Elementary School in Taipei, southeast China's Taiwan, Nov. 29, 2012. Food metarials are purchased through bidding in order to make sure of the nutrition, low price and taste of lunch for students. (Xinhua/Xing Guangli)

A worker prepares students' lunch at the dining hall of Dajia Elementary School in Taipei, southeast China's Taiwan, Nov. 29, 2012. Food metarials are purchased through bidding in order to make sure of the nutrition, low price and taste of lunch for students. (Xinhua/Xing Guangli)

Students of Dajia Elementary School wait in line to get their lunch in Taipei, southeast China's Taiwan, Nov. 29, 2012. Food metarials are purchased through bidding in order to make sure of the nutrition, low price and taste of lunch for students. (Xinhua/Xing Guangli)

Students of Dajia Elementary School enjoy their lunch in Taipei, southeast China's Taiwan, Nov. 29, 2012. Food metarials are purchased through bidding in order to make sure of the nutrition, low price and taste of lunch for students. (Xinhua/Xing Guangli)