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4hw.com.cn: Recently, a video of 'a tour guide leading the whole car of tourists to recite the garbage classification formula' became popular on the Internet, 'what can pigs eat?' Wet garbage! " What will the pig eat? " Hazardous waste! "& hellip; Netizen: 'I feel back to the primary school classroom', 'what a lovely guide. Do you have a kindergarten teacher qualification certificate!'