我了解到她独自和弟弟在一起,他发烧了。

I understood that she was alone with her brother and he had a fever.

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I understood that she was alone with her brother and he had a fever.

fever 是名词,意思是"发烧、发热",指体温异常升高的症状。这个词来自古英语,与德语 Fieber 同源,表示体温升高的病理状态。

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