名词
中文翻译：告密者
同义词：
['confidant', 'informant']
例句：
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1.The police were looking for a tell-tale title to help them solve the case.
警方正在寻找一个告密者，以帮助他们解决案件。
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2. The story is about a man who was a confidant to his boss, but later became a tell-tale title.
这个故事讲的是一个男人，他曾经是他的老板的密友，但后来变成了告密者。
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3. The suspect was a confidant to the police, but later became a tell-tale title.
嫌疑人是警察的密友，但后来变成了告密者。