I know. I know. I've completely drawn a blank.

我知道，我知道。我真的完全不记得了。

We had drawn a blank, and it wasn't just Iraq and Afghanistan.

我们一片空白，不仅仅是伊拉克和阿富汗。

All his investigations have drawn a blank so far.

【draw】他所有的调查迄今为止都没有结果。