The theoretical computations are performed under the assumption that the leptons are point particles.

计算 是在假定轻子是点粒子的条件下完成的。

youdao

HEPA filters capture almost all particles in the air that are zero point three microns in size or larger.

VOA: special.2009.07.14

And the reason for this, and this is a very important point about the photoelectric effect, and the point here is that the electrons here are acting as particles, you can't just add those energies together.

这个现象的原因是，这是光电效应非常重要的一个论点,这个论点就是电子,在这里是粒子行为，你不能仅仅把这些能量加在一起。

麻省理工公开课 - 化学原理课程节选

But HEPA filters cannot remove disease-causing particles smaller than zero point three microns.

VOA: special.2009.07.14

And, at this point, the tiny, dry insulin particles had such a large surface area relative to their mass that, like popcorn or flour, they poured unevenly, leaving air pockets and inconsistent doses.

FORBES: The Impossible Made Possible

This past year, however, his difficulties with swallowing advanced to the point where he could not eat without aspirating food particles, and he cycled between hospital and rehabilitation facilities with the pneumonias that resulted.

NEWYORKER: Letting Go

If you were to assume that every point in the universe contained some information, then even a small office would be so densely packed with particles that it would collapse in on itself like a black hole, says Raphael Bousso, a physics professor at the University of California, Berkeley.

FORBES: Flatland?