Incisive teeth; the piercing needle.

锋利的牙齿；尖利的针。

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The person performing the piercing disposes of the needle in a special container so that there is no risk of the needle or blood touching someone else.

穿刺后手术针被穿刺者妥善放入特殊容器中，以免他人被刺到或沾染血液的危险

youdao

"It was really painful - just like a needle piercing through my brain," he said.

“真的很痛苦——就像针穿过大脑。”他说。

youdao

From the valley below, each pier and mast merge to look like a single needle with an elongated eye: Foster's drawings, in fact, depict a thread piercing the eye of a needle.

WSJ: A Concrete Ribbon Through the Clouds | Millau Viaduct | Masterpiece by Joseph Giovannini