Molecular is the describing word that belongs to a molecule. A molecule is the smallest piece of a substance you can have that is still that substance.

Molecular molecular是 the describing word that belongs to a molecule屬於molecule（分子）的形容詞. A molecule分子是 the smallest piece of a substance you can have that is still that substance一種物質能有、卻還是那個物質本身的最小一份.

Split a water molecule any smaller and you no longer have water: you have hydrogen and oxygen, which behave differently.

Split a water molecule any smaller把水分子再切得更小, and你就 no longer have water不再是水了: you have你會得到 hydrogen and oxygen氫和氧, which behave differently這兩者性質不同.

Most molecules are two or more atoms holding together. A very few substances can exist as single atoms (the gases that almost never join with anything), and chemists still talk about them in the same breath.

Most molecules大部分分子 are是 two or more atoms holding together兩個以上原子結合在一起. A very few substances極少數物質 can exist as single atoms可以以單一原子存在 (the gases that almost never join with anything那些幾乎不跟任何東西結合的氣體), and而 chemists still talk about them in the same breath化學家還是把它們放在一起講.

You will meet molecular constantly in science class: molecular structure, molecular biology, molecular weight. It is school-and-lab English, not kitchen English.

You will meet molecular constantly in science class在自然課裡你會常常遇到 molecular這個字: molecular structuremolecular structure（分子結構）、molecular biologymolecular biology（分子生物學）、molecular weightmolecular weight（分子量）. It is是 school-and-lab English學校和實驗室用的英文, not not是 kitchen English廚房裡用的英文.

When someone says “at the molecular level,” they mean “down at the tiny scale of these units,” often as a way of saying “very, very small and basic.” The thing itself is the molecule; molecular only describes it.

When someone says有人說 "at the molecular level""at the molecular level"（在分子層次）, they mean他們的意思是 "down at the tiny scale of these units"「就在這些最小單位那麼小的層次」, often常常 as a way of saying只是想說 "very, very small and basic"「非常非常小、非常基本」. The thing itself is the molecule東西本身叫molecule（分子）; molecular only describes itmolecular只是用來形容它.