形容词
中文翻译：悲伤的
同义词：
['depressed', 'disheartened', 'melancholic']
例句：
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1. She looked so sad when she saw the news.
她看到新闻时看起来很伤心。
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2. His sadness was contagious; everyone felt downcast.
他的悲伤是传染性的，每个人都感到沮丧。
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3. Sadness can be a natural response to loss or disappointment.
悲伤是对失去或失望的自然反应。