They really don't know where to begin.

他们确实不知道从哪里入手。

youdao

But she did not know where to begin.

但她却不知道从哪里下手。

youdao

I feel lost and don't know where to begin.

我觉得好困惑，不知道从何开始。

youdao

But I did not know where to begin.

VOA: special.2010.01.30

And then it's the situation where you just don't know where to begin.

这时就出现你,不知道如何下手的局面。

哈佛公开课 - 计算机科学课程节选

And if you haven't yourself dived into your own problem set zero, whose PDFs are available online, realize that if something like this, given that it's a minute or so long, kind of looks you know, despite the cutesiness of it, kind of overwhelming in that you don't really know where to begin, how could you possibly sketch out this whole story line.

如果你还没有真正沉下心来,看习题集0，网上可以提供这些PDF文件，好好地感受一下像这样的东西，假定只有一分钟左右这么长,先不管它外表看起来是否可爱,也不管它让人无从下手的压迫感,你怎样才能勾勒出,整个故事最初的框架呢？

哈佛公开课 - 计算机科学课程节选

For many, it must feel impossible to know where to begin to carry on.

CNN: We love and fear the Oklahoma skies

Oy, there is so much wrong in those brief comments I barely know where to begin.

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This statement is so untethered from reality, it is hard to know where to begin.

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