形容词
中文翻译：悲伤的
同义词：
['depressed', 'disheartened', 'melancholic']
例句：
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1. She was so sad when she heard the news.
她听到那个消息时非常难过。
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2. His sadness over the loss of his dog was evident.
他对失去狗的悲伤显而易见。
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3. Sadness can be a natural response to loss or disappointment.
悲伤是对失落或失望的自然反应。