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一つ(や二つ)では済まない, literally "(listing) one or two won't suffice", is a set phrase that effectively means "there are quite a few". Assuming ゴミの分別 is used for the first time in this page, it is not a common metaphor for something. It just means "separation/sorting of garbage" here. ゴミの分別をしてもらいたいです is "I (=Riku) want him (=Baba) to sort garbage", implying that's ...


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