Undifferentiated describes something that has no clear separate parts, or that has parts you cannot tell apart from one another. It is the negative of "differentiated", so it always points at a difference that is missing. Two common ways it works: (1) a mass or group that has never been split up — an undifferentiated crowd, an undifferentiated block of time, an undifferentiated grey sky, where nothing stands out from anything else; (2) things that are technically separate but look or feel the same, so you cannot sort them — "the shops all sell the same undifferentiated products", meaning nothing makes one different from another.

Undifferentiated describes something that has no clear separate partsUndifferentiated用來形容一樣東西沒有清楚分開的部分， or that has parts you cannot tell apart from one another或者裡面的部分你分不出彼此有什麼不同。 It is the negative of "differentiated"它是『differentiated（已分化的）』的反義詞， so it always points at a difference that is missing所以它講的永遠是一種缺少的差異。 Two common ways it works它常見的用法有兩種： (1) a mass or group that has never been split up(1) 一整團從來沒被分開過的東西—— an undifferentiated crowd, an undifferentiated block of time, an undifferentiated grey skyan undifferentiated crowd（一群分不清彼此的人）、an undifferentiated block of time（一大塊沒有區隔的時間）、an undifferentiated grey sky（一片沒有變化的灰色天空）， where nothing stands out from anything else裡面沒有一樣東西特別突出； (2) things that are technically separate but look or feel the same, so you cannot sort them(2) 技術上分開、但看起來或感覺起來一樣的東西，所以你沒辦法把它們分類—— "the shops all sell the same undifferentiated products"『the shops all sell the same undifferentiated products（這些店賣的都是分不出差別的商品）』， meaning nothing makes one different from another意思是沒有一樣讓其中一個跟別的不一樣。

In biology it has a precise use: an undifferentiated cell is a young cell that has not yet become a particular kind of cell (a muscle cell, a nerve cell). Stem cells are undifferentiated.

In biology it has a precise use在生物學裡它有一個精確的用法： an undifferentiated cell is a young cell that has not yet become a particular kind of cellan undifferentiated cell（未分化細胞）是一種還沒變成特定種類細胞的年輕細胞 (a muscle cell, a nerve cell)（像肌肉細胞、神經細胞）。 Stem cells are undifferentiated幹細胞就是undifferentiated的。

In business writing it is nearly an insult — an undifferentiated product has nothing special, so people buy it only on price.

In business writing it is nearly an insult在商業寫作裡，這個詞幾乎算是一種侮辱—— an undifferentiated product has nothing specialan undifferentiated product（沒有區隔的產品）沒有任何特別之處， so people buy it only on price所以人們只會靠價格來決定要不要買。

The word is formal and long; you meet it in textbooks, science writing, and business reports far more than in speech. In everyday talk people just say "all the same" or "all mixed together".

The word is formal and long這個字既正式又長； you meet it in textbooks, science writing, and business reports far more than in speech你在教科書、科學寫作、商業報告裡遇到它的機會，遠比在口語裡多。 In everyday talk people just say "all the same" or "all mixed together"日常對話裡大家就直接說『all the same（都一樣）』或『all mixed together（全部混在一起）』。

Note it describes a state, not a fault of the person looking — that is a different word (see "undiscriminating").

Note it describes a state, not a fault of the person looking要注意，它形容的是一種狀態，不是看的人的過錯—— that is a different word (see "undiscriminating")那是另一個字（參見『undiscriminating』）。