從高處砸下來的水
這一家直接坐在核心畫面上：重點是水量和往下衝的力道。
noun · C2
A very large waterfall, where a whole river drops over the edge of a cliff at once. This is a literary word, used in poems, travel writing and older books.
大瀑布
核心畫面
One picture behind this word is water coming down all at once: a whole river going over an edge, too much of it, too fast, and loud enough to hear before you see it. That is the picture the waterfall and the flood senses share. The eye sense stands somewhere else, and Wiktionary files it under a separate origin — there the picture is a heavy gate lowered across a gateway, shutting the way.
這個字的其中一個畫面，可以想成「水一次全下來」：一整條河從邊緣翻過去，量太大、速度太快，還沒看到就先聽見聲音。大瀑布…更多收起
這個字的其中一個畫面，可以想成「水一次全下來」：一整條河從邊緣翻過去，量太大、速度太快，還沒看到就先聽見聲音。大瀑布和傾瀉大水這兩個用法，共用的就是這個畫面。眼睛那個意思不在同一條線上：Wiktionary 把它放在另一個來源底下，那裡的畫面比較像一道厚重的閘門被放下來，把路擋住。所以這個字其實裝著兩張不同的圖。From the word’s history
Wiktionary traces the waterfall noun to Ancient Greek katar(rh)aktes, rushing downwards, from a verb meaning to pour down or rush downwards. The falling water is the oldest layer of the word.
Wiktionary 把「瀑布」這個名詞追到古希臘文 καταρράκτης，意思是「向下衝的」，來自一個表示「往下傾瀉」的動詞。也就是說，這個字最早記錄的是一個動作，不是一個地點。先有「往下衝」，才有「大瀑布」這個東西。
Wiktionary entry 'cataract' etymology 1 (kaikki:3f6f69a190036ae4:503017532): 'from Latin cataracta (floodgate; waterfall), from Ancient Greek καταρ(ρ)άκτης (rushing downwards).'
Two branches
擋住視線的那一層
這一家跟上面的水沒有共用畫面，需要另外一張圖。
noun · B2
An eye condition in which the clear lens inside the eye slowly turns cloudy and white, so that a person sees less and less clearly.
白內障