To subdivide something is to cut into smaller pieces something that has already been cut up once. The 'sub-' carries that second step: you divide a book into chapters, then subdivide each chapter into sections. You divide a country into regions, then subdivide the regions into districts. If you are only cutting something whole for the first time, 'divide' is the word you want.

to subdivide something把東西subdivide， is to cut into smaller pieces就是切成更小的部分 something that has already been cut up once把已經切過一次的東西。 the 'sub-' carries that second step'sub-'帶出的就是那第二個步驟： you divide a book into chapters你先把一本書分成章， then subdivide each chapter into sections再把每一章subdivide成節。 you divide a country into regions你把一個國家分成幾個區域， then subdivide the regions into districts再把這些區域subdivide成幾個地區。 if you are only cutting something whole for the first time如果你只是第一次把一個完整的東西切開， 'divide' is the word you want你要用的字是'divide'。

It shows up in three places especially. In writing and organising: 'The report is subdivided into four parts.' In land and property, where it is close to a technical term — a farmer subdivides a large field into smaller plots to sell for houses, and in American English the noun 'a subdivision' has come to mean a whole housing estate built that way. And in science and classification: cells subdivide, categories are subdivided into types.

it shows up in three places especially它特別會出現在三個地方。 in writing and organising在寫作和分類整理裡： 'The report is subdivided into four parts.'「The report is subdivided into four parts.報告分成四個部分」。 in land and property在土地和地產方面， where it is close to a technical term這裡它接近一個專業術語 — a farmer subdivides a large field into smaller plots to sell for houses農夫把一大塊田subdivide成小塊土地拿去蓋房子賣， and in American English在美式英文裡 the noun 'a subdivision' has come to mean a whole housing estate built that way'a subdivision'這個名詞後來就指整片這樣蓋出來的住宅區。 and in science and classification還有在科學和分類學裡： cells subdivide細胞會subdivide， categories are subdivided into types類別會被subdivide成不同的類型。

It is often used in the passive ('the class was subdivided into groups of three'), which is a comfortable pattern to learn. The word is a little formal — in casual speech you would probably just say 'split it up again' or 'break it down further'.

it is often used in the passive它常常用被動式（ 'the class was subdivided into groups of three''the class was subdivided into groups of three班級被分成三人一組' ）， which is a comfortable pattern to learn這是個好學的固定句型。 the word is a little formal這個字有點正式 — in casual speech you would probably just say平常說話你大概會直接說 'split it up again' or 'break it down further''split it up again'或'break it down further'。