N a vegetable dye, administered as a liquid or in tablet form (disclosing tablet), that stains plaque, making it readily apparent on the teeth 菌斑染色剂 [dentistry]
I'll put a stain (disclosing agent) on your teeth to show you where your toothbrush has missed.
我在你的牙齿上涂上着色剂，让你看一看有什莫地方牙刷没有刷到。
youdao
Disclosing a covert agent's name is a criminal offence in the US, punishable by up to 10 years in prison.
BBC: NEWS | Americas | Contempt ruling in CIA leak case
He is not charged with deliberately disclosing the name of a covert agent, which is a federal offense.
CNN: Ex-Cheney aide pleads not guilty
Kiriakou pleaded guilty in October to disclosing classified information identifying a covert agent.
BBC: Ex-CIA officer Kiriakou 'made peace' with leak decision
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