So far, the police investigation has drawn a blank.

到目前为止警方的调查毫无结果。

《牛津词典》

The police are looking for the missing girl, but so far they've only drawn a blank.

警方正在寻找这位失踪的女孩，但是到目前为止都没有任何结果。

youdao

She lost her gloves yesterday and looked for it everywhere but she's drawn a blank so far.

她昨天把手套弄丢了，到处找，直到现在也没找到。

youdao

Bush has drawn a blank twice when asked to name any mistakes he has made while president.

CNN: Kerry: Closing loopholes will help fund promises

Diplomatic efforts to effect Mr Taylor's release have so far drawn a blank.

BBC: Wife's hope for kidnapped husband

For years the French investigation into Caroline's murder had drawn a blank.

BBC: NEWS | UK | England | Cornwall | 'Luck' led to Caroline's killer