We call that a massless string.

我们叫它无质量绳。

youdao

Let's call it a massless spring.

我们叫它无质量弹簧。

youdao

The Standard Model said they should be massless.

标准模型说他们应当没有质量。

youdao

So, a massless body cannot have a net force on it, because the acceleration of the rope cannot be infinite.

所以没有质量的物体不会受到力,因为绳子的加速度不可能是无穷大

耶鲁公开课 - 基础物理课程节选

And that's really neat to think about, because photons, of course, are massless particles, they have no mass, so it's neat to think about something that has no mass, but that actually does have a momentum.

而且那真的不容易想明白，因为光子，当然是无质量的粒子，它们没有质量，所以这个真的不容易想明白,一些物体没有质量，但是它们事实上确实有动量。

麻省理工公开课 - 化学原理课程节选

So, massless bodies will always have, like a massless rope, equal and opposite forces on the two ends.

所以无质量的物体,比如这个绳子,两边所受的力永远都相等

耶鲁公开课 - 基础物理课程节选

One peculiarity of massless particles is that they have to travel at the speed of light.

ECONOMIST: Cosmology

Dr Koshiba's second detector showed that neutrinos, previously believed to be massless, actually have a small mass.

ECONOMIST: The 2002 Nobel prizes: Windows on the world | The

If neutrinos were truly massless, the standard model would predict that their flavours would be fixed for ever.

ECONOMIST: Neutrinos