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1. She looked at him sadly, knowing that they could never be together.
她悲傷地看著他，知道他們永遠無法在一起。
2. Sadly, the concert was canceled due to the heavy rain.
遺憾的是，因為大雨，音樂會被取消了。
3. He sadly shook his head, realizing that he had made a terrible mistake.
他遺憾地搖了搖頭，意識到自己犯了一個可怕的錯誤。