hit the nail on the head字面意思是“一下子钉准到图钉钉帽”，引申为“击中要害；说到点子上；一针见血”。

【例句】
The last observation of yours has hit the nail on the head.
你最后的意见真是一针见血。

He hit the nail on the head when he mention that the company is actually facing the danger of bankruptcy.
他说那家公司实际上正面临破产的危机，真是一针见血。