The topic of addiction remains something of a taboo in our family.

毒瘾在我们家依然是个有些忌讳的话题。

《柯林斯英汉双解大词典》

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》

The subject is still a taboo in our family.

这个话题在我们家里仍然讳莫如深。

《牛津词典》

I mean,I think that knowing how HIV basically gets transmitted is something that people are afraid, that people know that they have had extra-marital sex-the whole concept of men who have sex with other men-- it's a big taboo, and the region does not want to admit that we have these groups.

VOA: standard.2010.07.07

But in the case of film studies, that was also a taboo subject until recently.

不过电影研究，一直以来也无人问津,电影研究的热潮也就是最近几十年的事情。

麻省理工公开课 - 电影哲学课程节选

Such doubts and fears have not gone, but criticising Hizbullah in public has become a taboo.

ECONOMIST: The Arab world

So often abuse becomes either a source of humor or a taboo discussion topic.

FORBES: Using the Golden Globes to Shine A Light On Domestic Violence

There is a taboo against giving aid to Myanmar for fear of bolstering the dreadful regime.

ECONOMIST: Myanamar after the cyclone