形容词
中文翻译：悲伤的
同义词：
['depressed', 'disheartened', 'melancholy']
例句：
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1. She looked at the sad expression on her friend's face and felt a pang of sympathy.
她看着朋友悲伤的表情，感到一阵同情。
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2. The sad news of his passing has left many people in shock.
他去世的消息让很多人震惊。
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3. His sadness was palpable as he walked through the empty streets.
他走在空荡荡的街道上，悲伤之情溢于言表。