Sometimes, we think they are dirty and we don't want to close to them. It's not right. They clean our environment by their hard work.
有的时候，我们会觉得他们很脏，甚至不想靠近他们，这是不对的，他们通过自己的辛勤工作使环境清洁了。
Sometimes, we think they are dirty and we don't want to close to them. It's not right. They clean our environment by their hard work.
有的时候，我们会觉得他们很脏，甚至不想靠近他们，这是不对的，他们通过自己的辛勤工作使环境清洁了。
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