形容词
中文翻译：伤心的
同义词：
['depressed', 'disheartened', 'disappointed']
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伤心。
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2. The loss of a loved one can be very sad.
失去一个亲人是非常难过的。
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3. He felt sad because he had to leave his home.
他感到伤心，因为他不得不离开他的家。