Made of just one cell. All the living work — eating, growing, getting rid of waste, making copies of itself — happens inside that single cell, with no division of labour between parts.

Made of just one cell只由一個細胞組成 All the living work所有維持生命的工作 eating吃東西 growing生長 getting rid of waste排掉廢物 making copies of itself自己複製自己 happens inside that single cell都在那一個細胞裡完成 with no division of labour between parts細胞內部沒有分工

Bacteria are unicellular; so is yeast, and so is an amoeba. You and a tree and a fish are multicellular, made of billions of cells doing different jobs.

Bacteria are unicellular細菌是unicellular（單細胞）的 so is yeast酵母菌也是 and so is an amoeba變形蟲也是 You and a tree and a fish而你、一棵樹、和一條魚 are multicellular則是multicellular（多細胞）的 made of billions of cells doing different jobs是由幾十億個各自分工的細胞組成的

This is a science word, at home in biology class, textbooks and lab reports, and almost nowhere else. In everyday English people say single-celled instead, which means exactly the same thing and sounds far more natural: "single-celled organisms". If you meet the word in an exam, though, unicellular is the term you want.

This is a science word這是一個科學用字 at home in biology class, textbooks and lab reports常出現在生物課、教科書、和實驗報告裡 and almost nowhere else其他地方幾乎不會用到 In everyday English在日常英文裡 people say single-celled instead大家會改說single-celled which means exactly the same thing意思完全一樣 and sounds far more natural而且聽起來自然得多 "single-celled organisms"像"single-celled organisms"（單細胞生物） If you meet the word in an exam, though不過如果你在考試裡遇到這個字 unicellular is the term you want你要用的就是unicellular

A gentle warning about a habit of thought: unicellular does not mean simple or primitive. One cell can be extraordinarily complicated inside, and unicellular life has been succeeding on this planet far longer than we have.

A gentle warning about a habit of thought提醒一個容易有的錯誤想法 unicellular does not mean simple or primitive unicellular不代表「簡單」或「原始」 One cell can be extraordinarily complicated inside一個細胞內部可以複雜得驚人 and unicellular life has been succeeding on this planet而且單細胞生物在這個星球上一直活得很成功 far longer than we have時間比我們人類長得多