atomic theory

基本解释

Because atomic theory explains things.
因爲原子理論能夠解釋一些現象
Democritus’ atomic theory has other modern connotations.
德謨尅利特的原子論還具有另一個現代的隱含意義。
then you can see how you can have very easily different arrangement of corpuscles within substances, a kind of atomic theory.
那麽就能輕易地看到,物質中微粒的不同搆成，那就是原子理論。

So, up here, atomic theory, periodic table, bonding, structures and molecules.
原子理論，元素周期表，價鍵，分子結搆。
麻省理工公開課 - 化學原理課程節選
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.
他們會有這樣的感覺,是因爲他們剛，經歷科學上的,大繁榮期，包括牛頓力學,道爾頓物質原子理論，熱力學和電磁學,都取得了巨大進展。
麻省理工公開課 - 化學原理課程節選
Because atomic theory explains things.
因爲原子理論能夠解釋一些現象
耶魯公開課 - 死亡課程節選

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