To hit the nail on the head; to pinpoint the issue with a single, sharp remark.
比喻说话直截了当，切中要害。
毛泽东《反对党八股》这不是把我们的毛病讲得一针见血么？不错，党八股中中国有，外国也有，可见是通病。”
Her comment about the project's flaw was one needle seeing the blood.
Learn the next connected idiom: 一针见血 (yī zhēn jiàn xuè) → 血流如注 (xuè liú rú zhù)
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