Doctors can collect it with a needle. But people who donate marrow must first have tests to make sure they are a good match for the patient.

VOA: special.2009.12.16

When you're driving in your car, there's a needle and the needle says 60; that's your velocity at this instant.

当你在开车时,有一根指针指着60,表示你这个时刻的速度

耶鲁公开课 - 基础物理课程节选

it's like finding a needle in a hay stack.

这简直是大海捞针。

It's like 课堂 - SpeakingMax英语口语达人

For example, they might stick themselves with a needle while treating patients.

VOA: special.2010.02.10

It involves putting a needle, a fairly large needle into usually one of the pelvic bones and collecting marrow from which is tissue that's deep inside those bones.

先要用针头,相当大的针头刺进你的盆骨,然后进行收集,这些在骨头深处的骨髓

耶鲁公开课 - 生物医学工程探索课程节选

"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

This spring is getting squashed on either side, and it'll squash by certain amount x, that depends on your mass, and that x will be turned into a motion of a needle and that'll read your mass.

这个弹簧两边都会受到压缩,压缩量为 x,它由你的质量决定,x 会转换成指针的运动,你从而可以读数

耶鲁公开课 - 基础物理课程节选

Such needle sticks are common. But a recent study found that medical students often fail to report them.

VOA: special.2010.02.10

A special needle is inserted directly into the tumor and light energy is passed through a laser.

VOA: special.2010.11.23

Another popular type, the quill mum,has long, straight petals like a tube or needle.

VOA: special.2010.06.29

The Space Needle has a wide base on the ground.

VOA: special.2009.03.04