我不知道多少学校已经倒塌。

I don't know how many schools collapsed.

youdao

我不知道多少城镇被破坏。

I don't know how many towns were destroyed.

youdao

我不知道多少花儿落到了地上。

I wonder how many flowers fell on the ground.

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

I didn't even need to know that heat capacity of the product, right. Because it's effect the thermal mass of the product is negligible compared to the thermal mass of the calorimeter.

我甚至不需要知道生成物的,热容是多少，因为生成物的,热质量的作用相比于,量热计的热质量是可以忽略的。

麻省理工公开课 - 热力学与动力学课程节选

Let's assume that I know what I'm earning next year; there is actually uncertainty about it.

假设我知道我明年会赚多少钱,虽然这通常都是不确定的

耶鲁公开课 - 金融市场课程节选