waterbed 水床（也說水床墊）。台灣人多半是從電影或旅館裡認得這個詞，不是自家常見的東西；講到「水床」常帶點復古、七八〇年代美式的味道。醫療用途上的水床墊則是正經用法，用來幫長期臥床的人分散壓力、避免褥瘡。別跟溫泉、SPA的「水療床」搞混。｜字脈

1
A waterbed is a bed whose mattress is a large plastic or rubber bag filled with water instead of springs and cotton. When you lie down, the water moves under you and takes the shape of your body, so it feels soft and a bit like floating. If you move, you can feel a small wave — and so can the person sleeping next to you, which is either fun or depending on who you ask. The word carries a strong period feeling. Waterbeds were very fashionable in the 1970s and 80s, especially in America, and they were sold as luxurious, modern, slightly sexy. Because of that, when someone mentions a waterbed today it often comes with a joke or a smile, the way people talk about lava lamps or disco. They are much rarer now — they are heavy (a full one can be too heavy for an old floor), hard to move, need electricity to keep the water warm, and if the bag tears you have a very bad day. So a young person in Taiwan may know the word from films without ever having seen one. There is one place they are still genuinely used and taken seriously: hospitals and care homes sometimes use water mattresses for patients who must stay in bed a long time, because spreading the weight evenly helps prevent . That use has no joke attached to it at all.
水床（也說水床墊）。台灣人多半是從電影或旅館裡認得這個詞，不是自家常見的東西；講到「水床」常帶點復古、七八〇年代美式的味道。醫療用途上的水床墊則是正經用法，用來幫長期臥床的人分散壓力、避免褥瘡。別跟溫泉、SPA的「水療床」搞混。
例句逐字對照、搭配詞、易混淆字
這一義的完整解析還沒打開。訂閱後可以看到例句怎麼拆、常跟哪些字一起出現，以及容易跟它搞混的字。
看看訂閱內容

組成water + bed — a compound of two very ordinary English words, joined and written as one. Nothing hidden here; the word says exactly what the thing is, which is why it needed no explanation when it was invented.

同家族的字

waterfallanother everyday water- compound, written as one word
bedroomthe same plain `bed` joined to another noun the same way
sunbedsame pattern with a different first word — a bed you lie on to get a tan

原始詞典資料1 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。

waterbednoun

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A bed with a tough plastic mattress filled with water.
- When I ask to sleep over at my friends’ houses, I am told I am not allowed. Boys are not allowed. My friend Caitie’s mother argues about this on the phone with my mother. I realize my mother is not on my side. Later, my mother tells me Caitie’s mother is divorced, has a tattoo, and sleeps on a waterbed, the relevance of which doesn’t seem clear. I think Caitie’s mother is cool.

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。