垃圾分类包括四种类别：可回收物、有害垃圾、干垃圾和湿垃圾。
Garbage sorting includes four categories—recyclable, harmful, dry and wet waste.
塑料和纸制品在颜色和类别的分类上都显得不足。实际上，有很多种类的塑料制品压根就没有被回收。
Plastic and paper is separated into fewer colours and categories; indeed, many types of plastic are not accepted at all.
但如果你真的必须想按旅游习惯分类，或许我会建议这两种类别：探索者和休闲者。
If you really had to group people by their travel habits, I'd say there are probably two different categories out there: explorers, and relaxers.
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