Each proton (or neutron) has about two thousand times the mass of an electron.

每一个中子或者质子的质量都是一个电子的两千倍。

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By 1911, scientists had already measured the charge and mass of an electron. But no one was sure how the atom was structured.

在1911年之前，科学家认为电子带有电荷以及质量，但没有人很确认原子是怎样组成的。

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And I think people would start looking to see, well, maybe other dimensionless ratios like the ratio of the mass of the electron to the mass of the proton are changing.

而且我认为人们也会开始考虑，像电子的质量对质子的质量的比值，也许其他无量纲的常数也在发生变化。

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If the atom is fixed mass, the electron is tiny, It must be the positives have all the mass.

如果是原子质量一定，电子很小，带正电荷的部分几乎占据了全部质量。

麻省理工公开课 - 固态化学导论课程节选

And this is just a Newtonian expression of momentum, the product of the mass of the electron times its instant velocity.

这只是牛顿学上关于动量的表达，用电子质量,乘以瞬时速度。

麻省理工公开课 - 固态化学导论课程节选

And this spin is an intrinsic quality of the electron, it's a property that is intrinsic in all particles, just like we would say mass is intrinsic or charge is intrinsic.

自旋是电子的本征量，它是所有粒子的本征性质，就像我们说质量是本征的或者电荷是本征的。

麻省理工公开课 - 化学原理课程节选

And that resistance is what we, in our big everyday world, think of as the mass of the electron.

CNN: Scientists more certain that particle is Higgs boson

The AMS paper will report the positron-electron ratio in the mass range of 0.5 to 350 Gigaelectronvolts.

BBC: Alpha Magnetic Spectrometer to release first results

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