But, because they interact only very weakly with normal matter, detecting them is difficult.

但是，因为他们对平常物质只有非常微弱的影响，对之进行观测十分困难。

youdao

Merely changing the way in which gravity ACTS on normal matter cannot explain this distribution.

仅修正引力对普通物质的作用方式是无法解释这一情形的。

youdao

To release it, just allow an antiparticle to come into contact with normal matter, and then capture the energy released.

而且只需要将反物质和它所对应的正常物质进行接触就能帮助它释放能量并进行能量收集。

youdao

"These are the same kind of fine matter found in normal air pollution.

VOA: standard.2010.04.16

In fact, previous observations using different techniques had already shown that normal matter was about a fifth of the total.

ECONOMIST: Astronomy

Both theory and previous observations suggest there is more dark energy than dark matter, and more dark matter than normal matter.

ECONOMIST: Astronomy

Normal matter, which is mostly gas, has pressure and that resists gravity.

ECONOMIST: Astronomy