像水一樣可變、流暢
把水的兩個特性借去形容抽象的事：水沒有固定形狀（所以是「易變」），水流動時很順（所以是「流暢」）。
changeable, not fixed · adjective · C2
Able to change easily; not fixed or settled yet.
易變的 / 不固定的
核心畫面
Picture water finding its own path — it has no fixed shape, it pours, slides, and takes the form of whatever holds it, always able to move and reshape. That quality of flowing, of not being locked into one rigid form, is the picture under every use of the word.
可以想成水在流動：它沒有固定形狀，會傾倒、會滑動，倒進什麼容器就變成什麼樣子，隨時能移動、能重新成形。這種「會流、不…更多收起
可以想成水在流動：它沒有固定形狀，會傾倒、會滑動，倒進什麼容器就變成什麼樣子，隨時能移動、能重新成形。這種「會流、不被鎖成一個硬邦邦形狀」的感覺，就是 fluid 每個用法底下的畫面。From the word’s history
From Latin fluidus 'flowing, moist', from fluere 'to flow' — the same root behind flow, fluent, and flux; the word literally names the thing that flows.
來自拉丁文 fluidus（會流的、濕潤的），源自動詞 fluere（流動）——和 flow、fluent、flux 同一個字根。所以這個字骨子裡講的就是「會流的東西」，核心畫面天生就是流動。
etymonline.com/word/fluid
From the picture
Also in this word
liquid · noun · C2
A liquid; something that can flow, like water or oil.
液體 / 流體
in liquid form · adjective · C2
Being a liquid; in a form that can flow.
液態的
原始詞典資料8 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
fluidnoun/ˈfluːɪd/
- 1
Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.
- An extreme version of vorticity is a vortex. The vortex is a spinning, cyclonic mass of fluid, which can be observed in the rotation of water going down a drain, as well as in smoke rings, tornados and hurricanes.
- 2
A liquid (as opposed to a solid or gas).
- fluid inclusion Petrology, a tiny fluid- or gas-filled cavity in an igneous rock. 1-100 micrometers in diameter, formed by the entrapment of a fluid, typically that from which the rock crystallized.
- The Doctor: Get a good night's sleep and drink plenty of fluids. / Kes: Fluids? / The Doctor: Everybody should drink plenty of fluids.
- 3
medicinesciencesIntravenous fluids.
fluidadj/ˈfluːɪd/
- 1
Of or relating to fluid.
- 2
In a state of flux; subject to change.
- Economics is a messy discipline: too fluid to be a science, too rigorous to be an art. Perhaps it is fitting that economists’ most-used metric, gross domestic product (GDP), is a tangle too. GDP measures the total value of output in an economic territory. Its apparent simplicity explains why it is scrutinised down to tenths of a percentage point every month.
- 3
Moving smoothly, or giving the impression of a liquid in motion.
- Tom of the fluid pelvis, undulating about the living room in defiance of Michael's taboo on sensuality.
- 4
Convertible into cash.
- 5
rareGenderfluid.
- Oh, Loki made sure of that. My mortal parents blamed him for the way I was, for being fluid.
- As do renewals in genres such as romcoms and teen movies, which have updated sexist, heteronormative tropes to reflect audiences’ fluid, inclusive, queer realities.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。