Please let me know how many are coming, if any.

请告诉我，如果有人要来的话，有多少？

《牛津词典》

Roads of the future may be able to know how many people are on them.

未来的道路可能会知道有多少人在该路上。

youdao

You don't know how many packs are without manuals?

你不知道有多少包装里是没有说明书的吗？

youdao

"I have been blown up three or four times,three times, and I have been shot at I do not know how many times and then I had diphtheria, measles and pneumonia,"

VOA: standard.2009.11.04

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

But for the most part, I mean, I've seen... I don't know how many times I've seen paparazzi almost get hit by cars.

但是大部分情况下，我是说，我见过……我都忘了多少次我看到狗仔队差点被车撞上。

溺爱是一种伤害 - SpeakingMax英语口语达人

Wal-Mart security officers were also present overnight, but he said he did not know how many.

CNN: Wal-Mart worker dies in rush; two killed at toy store

And we also don't know how many lenders are really going to adopt this thing.

NPR: Credit-Reporting Agencies Create New Scoring Format

Bell, a Charlotte attorney, said he didn't know how many had responded ahead of Friday's deadline.

NPR: Court Tries To Reach Deals With NC Ponzi 'Winners'