Cancer is a taboo subject and people are frightened or embarrassed to talk openly about it.

癌症是个禁忌的话题，人们对公开谈论它感到害怕或尴尬。

《柯林斯英汉双解大词典》

Eating human flesh is a taboo in civilized countries.

在文明国家，吃人肉是一种禁忌。

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However, disclosing too much personal information in cover letter is a taboo.

然而，在信中暴露过多个人信息却是大忌。

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There is a taboo that left-leaning critics of popular culture are obliged to observe: never criticize the populace.

NEWYORKER: The Reality Principle

"It is a taboo in Qatar to see somebody wearing the national dress and drinking, " said Hassan Al Ibrahim, a Qatari commentator.

WSJ: Qatar, Unveiling Tensions, Suspends Sale of Alcohol

Nearly 5 million South Africans may have AIDS, medical experts estimate, and for many in the country discussing the disease is a taboo.

CNN: Profile: Nelson Mandela's long walk