名词
中文翻译：刺探
同义词：
['spying', 'infiltration']
例句：
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1.The spying operation was a success, but the target was not found.
间谍行动成功了，但目标没有找到。
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2. The infiltration of the enemy forces was very successful.
敌军的渗透非常成功。
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3. They conducted a thorough investigation into the matter.
他们对此事进行了彻底的调查。