A molecule is the smallest piece of a substance that is still that substance. One molecule of water is still water. If you break that piece apart, you do not have water any more — you have smaller bits called atoms.

A molecule is molecule是 the smallest piece of a substance一種物質裡最小的一小塊 that is still that substance而且還算是那種物質 One molecule of water一個water molecule（水分子） is still water仍然是水 If you break that piece apart如果你把那一小塊拆開 you do not have water any more你就不再有水了 you have smaller bits你會得到更小的東西 called atoms叫做atoms（原子）

Most molecules are two or more atoms holding on to each other; a very few substances are just one atom, but school science still talks about them in the same family of ideas.

Most molecules are大部分molecule都是 two or more atoms holding on to each other兩個以上的atoms互相抓在一起 a very few substances are just one atom只有極少數物質是單一個atom but school science still talks about them但學校的科學課還是會講到它們 in the same family of ideas把它們歸在同一類概念裡

This is a classroom and lab word. In news and everyday talk people sometimes use it loosely, as if it only meant “a tiny bit.” Though actually, a spoon of sugar already holds an enormous number of molecules, so “tiny” in ordinary life is still huge at this scale. You will meet it in chemistry, medicine, and talk about air and plastic.

This is a classroom and lab word這是教室和實驗室裡會用的字 In news and everyday talk在新聞和日常對話裡 people sometimes use it loosely有人會鬆散地用它 as if it only meant 'a tiny bit'好像它只是「一點點」的意思 Though actually不過其實 a spoon of sugar already holds an enormous number of molecules一匙糖裡就已經有數量龐大的molecule了 so 'tiny' in ordinary life is still huge at this scale所以日常生活說的「一點點」在這個尺度上其實還是很多 You will meet it你會遇到這個字 in chemistry, medicine, and talk about air and plastic在化學、醫學，還有講到空氣和塑膠的內容裡

It is not a kitchen word, and it is not the animal mole, and it is not the chemistry unit called a mole, even though those words sit beside it on the page.

It is not a kitchen word它不是廚房裡會用的字 and it is not the animal mole也不是動物的mole（鼴鼠） and it is not the chemistry unit called a mole也不是化學裡叫做mole（莫耳）的那個單位 even though those words sit beside it on the page雖然這些字在字典頁面上會排在它旁邊