形容词
中文翻译：悲伤的
同义词：
['depressed', 'disheartened', 'downcast']
例句：
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1. She looked at the sad expression on her friend's face.
她看着朋友悲伤的表情。
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2. The news of his death was a source of sadness for many people.
他去世的消息让许多人感到悲伤。
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3. Sadness can be caused by a variety of factors, including stress and loss.
悲伤可以由多种因素引起，包括压力和失落。