Draw a blank:
To fail to get an answer or a result.
“Draw a blank” 在口语中用来表示 “未能得到回应或答复”。它由动词 “draw（得出，推断出）” 和 “a blank（空白）” 组成。
例句
The investigation is still open. So far, every lead has drawn a blank.
调查仍在进行中。到目前为止，每条线索都扑空了。
I still haven’t found my keys. I have looked everywhere but keep drawing a blank!
我还是没有找到我的钥匙。我已经找遍了所有的地方，但仍一无所获！
She looked really upset. Luckily, Felix always knows the right thing to say. He never draws a blank.
她当时看起来很沮丧。但幸好费利克斯总是知道该说什么来帮她宽心。他从来都不让人失望。
