形容词
中文翻译：悲伤的
同义词：
['depressed', 'gloomy', 'melancholy']
例句：
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1. She looked at the sad expression on her friend's face.
她看着朋友脸上悲伤的表情。
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2. The news of their divorce was a source of sadness for them both.
他们离婚的消息让他们都感到悲伤。
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3. He couldn't help but feel sad when he heard the bad news.
他听到那个坏消息时忍不住感到悲伤。