貼在別的東西上的標籤
把「帶鹽的水」這個畫面壓成一張標籤，貼到名詞前面。貼上去之後，要看被貼的是誰，意思才會定下來。
adjective · B1
Living in, or coming from, water that has salt in it — almost always the sea. It is used in front of nouns for animals, fish, and plants.
鹹水生的、海裡的
核心畫面
You can picture saltwater as one plain thing first: water with salt in it — the water of the sea. Hold that picture, and everything else is a label peeled off it and stuck onto another word. Stick it on a living thing and you get where that creature belongs. Stick it on a lake or a pool and you get what is inside it. Stick it on a group of people, and you are no longer talking about water at all — only about where they sit on a map.
saltwater 可以先想成一樣很單純的東西：帶鹽的水，也就是海水。先把這個畫面抓住。其他用法都像是從這攤水上撕下…更多收起
saltwater 可以先想成一樣很單純的東西：帶鹽的水，也就是海水。先把這個畫面抓住。其他用法都像是從這攤水上撕下一張標籤，再貼到別的字上面。貼在生物身上，講的是牠住在哪一種水裡。貼在湖、池、缸上面，講的是裡面裝的是什麼水。貼到一群人身上，就已經不是在講水了，而是在講他們在地圖上的位置。From the word’s history
From Middle English saltwater, salte water — literally salt plus water, the same two pieces still visible in the modern spelling.
來自中古英文的 saltwater / salte water，就是 salt（鹽）加 water（水）。今天的拼法裡這兩塊還看得出來，所以「有鹽的水」這個畫面一直沒有離開這個字。
Wiktionary entry for saltwater (kaikki:3f6f69a190036ae4:1175255880): "From Middle English saltwater, salte water, equivalent to salt + water."
Two branches
美國經濟學圈的地理外號
這一支離水最遠，但路還看得見：靠海的學校叫 saltwater，內陸的叫 freshwater，用身邊的水替兩派取名字。
adjective · C2
In writing about economics, used for economists and university departments that follow Keynesian or New Keynesian ideas. The name comes from universities near the coasts of the United States, and the opposite group is called freshwater.
（經濟學）鹹水派的