atomic theory

基本解释

Because atomic theory explains things.
因为原子理论能够解释一些现象
Democritus’ atomic theory has other modern connotations.
德谟克利特的原子论还具有另一个现代的隐含意义。
then you can see how you can have very easily different arrangement of corpuscles within substances, a kind of atomic theory.
那么就能轻易地看到,物质中微粒的不同构成，那就是原子理论。

So, up here, atomic theory, periodic table, bonding, structures and molecules.
原子理论，元素周期表，价键，分子结构。
麻省理工公开课 - 化学原理课程节选
And they had this feeling because there had just been this huge boon of discovery, of scientific advances that included Newtonian mechanics, it included Dalton's atomic theory of matter, also thermodynamics and classical electromagnetism.
他们会有这样的感觉,是因为他们刚，经历科学上的,大繁荣期，包括牛顿力学,道尔顿物质原子理论，热力学和电磁学,都取得了巨大进展。
麻省理工公开课 - 化学原理课程节选
Because atomic theory explains things.
因为原子理论能够解释一些现象
耶鲁公开课 - 死亡课程节选

We can understand atomic theory, and we can understand literature and learn about the great works of art and all the great things of culture, but why?
FORBES: Has Education Lost Its Soul? (Pt. 2)

any theory in which matter is regarded as consisting of atoms, esp that proposed by John Dalton postulating that elements are composed of atoms that can combine in definite proportions to form compounds