名词
中文翻译：抱怨
同义词：
['discontent', 'grievance', 'complaint']
例句：
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1.She complained about the long wait in the line.
她对在队伍中等待的时间表示不满。
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2. He made a complaint about the service at the restaurant.
他对餐厅的服务提出了投诉。
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3. The company received numerous complaints from customers about the product quality.
该公司收到了许多关于产品质量的投诉。