名词
中文翻译：悲伤的傻瓜
同义词：
['sentinel', 'mourner']
例句：
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1.She was so sad that she couldn't even smile.
她非常伤心，甚至都笑不出来。
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2. He was a sad sackwho always cried over trivial matters.
他是个总是为小事哭泣的悲伤之人。
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3. Thesad sack sat alone in the corner,feeling utterly alone.
那个悲伤的人独自坐在角落里，感觉完全孤独。