Photons have no mass – they are weightless.

光子没有质量——它们是没有重量的。

《柯林斯英汉双解大词典》

Photons have no mass - they are weightless.

光子没有质量——它们是无重的。

youdao

They suggested that all particles had no mass just after the Big Bang.

他们提出大爆炸最初所有的粒子都没有质量。

youdao

He can no more judge the wishes of the great mass of our people by the words of these middlemen than he can measure the ocean's silent depths by the foam upon its waves."

VOA: special.2010.06.24

We don't say anything about implicitly here, we're talking about a closed system, so there's no mass leaving the system.

我们不讨论,这是隐含条件，因为我们讨论的是孤立系统，因此系统没有物质流失。

麻省理工公开课 - 热力学与动力学课程节选

If a photon which has no mass can behave as a particle, does it follow then an electron which has mass can behave as a wave? 1920.

如果一个没有质量的光子,能像粒子一样运动，那么它能像一个,没有质量的电子那样以波的形式运动吗。

麻省理工公开课 - 固态化学导论课程节选

The electron would have no mass if it were not for this "substance, " the field made of Higgs particles.

CNN: Scientists more certain that particle is Higgs boson

Yet, there are no mass movements against heartbreak or demonstrations in the streets.

FORBES: More Die of Heartbreak, More Often Than You Might Think

He is a shrewd manipulator behind the scenes, but has no mass appeal.

ECONOMIST: India