This particle has a very small mass.

这种粒子的质量很小。

youdao

It may have a very small mass, small speed.

它的速度可能非常小。

youdao

A small mass of soft material, often folded or rolled, used for padding, stuffing, or packing.

填充物一块软的物体，常叠着或卷着，用于垫料、填充或包装。

youdao

Further, the nucleus is assumed to be the seat of the essential part of the mass of the atom, and to have linear dimensions exceedingly small compared with the linear dimensions of the whole atom."

进一步的，核被认为是,原子主要质量所在的地方，和整个原子线性尺度相比,核具有很好的线性尺度“

麻省理工公开课 - 固态化学导论课程节选

If we think of the size of a typical atom, we would say that would be about 10 to the negative 10 meters. So, we can see the diameter of a nucleus is absolutely smaller really concentrating that mass into a very small space.

一个普通细胞的大小，抱歉，我和细胞核搞混了0,如果我们考虑，一个普通原子的大小,这大概是10的负十次方米,所以原子核的直径确实非常小,真的是把质量。

麻省理工公开课 - 化学原理课程节选

He said the team has produced compelling evidence that neutrinos do, indeed, have a very small mass.

ECONOMIST: Neutrinos

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

China has gotten rich over the last thirty years, in part, from exporting the small mass-market consumer goods that fill the shelves of my local Target before they make their way into my apartment.

FORBES: What Will We Do With All That Stuff Made In China?