What they say doesn't matter to me.
他们说什么都跟我没关系。
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今天的几个句子是有关不在乎的：1. It has nothing to do with me. 这跟我没关系。2. I don't care what they say. 我才不在乎他们说什么。3. Other people's opinions don't matter to me. 别人说什么对我不重要。