我不知道有多少女性面部长有毛发，因为大部分人会把它拔掉。

We have no idea how many women grow hair on their faces, because the vast majority will pluck it out.

youdao

我不知道有多少，我们没有做过具体的预测。

I don't know how many, we're not making specific forecasts.

youdao

我不知道有多少，但我今天交易超过十亿美元。

I don't know how much money what you made, but I've traded over a billion dollars today.

youdao

I don't know how many kids, generation after generation, get in trouble because they do not remember the following fact.

我不知道有多少孩子,一代又一代,因为没有记住下面的内容而遇到困难

耶鲁公开课 - 基础物理课程节选

Yeah, it was a good film. I mean, I don't know how much of it was accurate or not.

它是一部好电影。我的意思是，我不知道有多少内容是准确的。

英国电影的魅力 - SpeakingMax英语口语达人

I don't know how many know that there are trace, trace amounts, of cyanide in almonds.

我不知道有多少人知道在杏仁中有非常，非常微量的氰化物。

麻省理工公开课 - 化学原理课程节选