Every substance, no matter what it is, is composed of very small particles called molecules.

各种物质，不论它是什么，都是由一些称为分子的很小的粒子构成的。

《新英汉大辞典》

But that doesn't mean that life as we know it can't exist, it's just composed of matter governed by different laws.

但是这并不意味着我们所理解的生命不会存在，它们只是由被不同法则所支配的物质构成。

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Rocks are made from minerals, which like all matter are composed of individual chemical elements.

岩石由矿物构成，矿物像所有物质一样，由各种化学元素组成。

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These are the planks of his model, that matter is composed of atoms that are indivisible and indestructible.

这些是，他的模型的一些内容，物质是有原子组成的,不可分割且不可毁灭的。

麻省理工公开课 - 固态化学导论课程节选

They think the universe is stuffed with invisible dark matter composed of particles very different from the ones that make up visible matter, and it is the gravity of this dark matter that holds galaxies together.

ECONOMIST: Spotting dark matter, at last

Cosmologists reckon that at least a quarter of the universe is composed of dark matter, a mysterious substance that neither emits nor absorbs light.

WSJ: New Data Boosts Case for Higgs Boson Find

The "concordance" model of the Universe proposes that over 70% is made up of dark energy, with around 25% composed of dark matter and only 5% of normal matter.

BBC: NEWS | Science/Nature | Dark energy tops science class