In fact, in Cartesian ontology there are only three kinds of substance: mind, matter and God.

其实在笛卡尔的本体论中，世界上只有三种实体：心灵、物质和上帝。

youdao

Though this may be true, it is unlikely that any reasonably successful theory of causation would support the Cartesian distinction between two different kinds of substance, mind and matter.

也许这话说得有道理，但是任何一种关于因果性的成功理论都不会支持笛卡尔将心灵和物质区分为两种实体的做法。

youdao

The mysterious substance known as dark matter may actually be an illusion created by gravitational interactions between short-lived particles of matter and antimatter, a new study says.

一项新的研究表明：被称作暗物质的神秘物质可能只是一种虚像，由物质与反物质的短寿命粒子之间的引力相互作用而产生的。

youdao

There, finding just the right substance is a matter of painstaking trial and error, which has continued over decades.

ECONOMIST: Combinatorial chemistry

And even then, the real significance is more a matter of style than substance.

CNN: A Message To Investors

This invisible substance apparently makes up five-sixths of the universe's matter, and its gravitational attraction is what's thought to hold galaxies together.

MSN: We could soon detect the first stars in our universe