他们感到很累
They feel very tired
以上为机器翻译结果，长、整句建议使用 人工翻译 。
走了十英里以后，他们感到很累。
Having walked for ten miles, they felt very tired.
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马克和凯萨琳往岩石那里游，不过他们抵达时，感到很累。
Mark and Kathleen swam out to the rocks, but when they got there, they were very tired.
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