Brooklyn Nine-Nine · 시즌 1
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hit a wall

碰壁;遇到障碍

字面意思是「撞到墙上」,引申为在某个任务、项目或进展中遇到了无法克服的困难或障碍,卡住了,无法继续前进。这里指调查线索断了。

None of the partials returned any matches.
Nobody in your building saw anything. We've hit a wall.
So what do we do next?