Your skin is then punctured with a very sharp, clean needle.

穿刺的针非常尖而且是干净的。

youdao

As well as needle-sharp claws, the undersides of the feet are covered with short, spine-like scales, which ensure a firm grasp.

同样它也是锋利的鹰爪，在鹰爪的下面有一个短而象倒刺一样的脚掌，以确保紧紧地抓住猎物。

youdao

When I drink something cold, there is a sharp pain, like being pierced by a needle.

喝冷的东西时，感到牙齿刺痛，就像被针刺一样。

youdao

"This needle is still sharp enough to penetrate through body tissue.

VOA: special.2010.02.10

"A needle that goes through the skin needs to be as sharp as possible because that's going to be associated with the easiest access, the more slick closure, and the less pain when somebody has, say their blood drawn or their skin closed."

VOA: special.2010.02.10

Scientists used the microscope to control a tiny, super-sharp needle along a copper surface, IBM said.

WSJ: IBM makes tiny movie by pushing molecules around

Highly polished beveled edges reflect light in two directions for better legibility and emphasize needle-sharp tips, lending an air of Germanic precision.

FORBES: The Face of Time