名词
中文翻译：告密者
同义词：
['confidant', 'informant', 'informer']
例句：
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1. The police are investigating the case of a suspected mole in their department.
警方正在调查他们部门涉嫌内鬼的案件。
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2. The spy was a trusted confidant to the king.
这个间谍是国王的心腹。
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3. The informant provided crucial information that led to the arrest of the suspect.
告密者提供了关键信息，导致嫌疑人被捕。