四类是一个汉语词语，拼音是sì lèi，意思是古代天子在四郊祭祀天神。
如今，上海的日常生活垃圾被要求分为四类。
Now waste from daily life in the city of Shanghai is required to be separated into four different groups.
德阳从几年前就开始将垃圾分成同样的四类。
Deyang has been sorting its rubbish into the same four groups since several years ago.
居民应将垃圾分成四类——厨余垃圾、可回收垃圾、有害垃圾和其他垃圾。
Residents should sort their garbage into four groups kitchen, recyclable, hazardous (有害) and other waste.
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