One picture holds this whole word: something flat riding on top of the water instead of sinking into it. A board with a person standing on it, along behind a boat. The water is not being cut through; it is being ridden on. Once you can see that, the car use is the same picture with different equipment, because a tyre on a film of is also a flat thing riding on top of water.

這個字可以想成一個畫面:一樣平平的東西貼在水面上滑過去,而不是沉進水裡。板子上站著人,被快艇拖著,整塊板子浮在水面往前跑。水沒有被切開,是被「踩在上面」。有了這個畫面,車子那個意思就好懂了:輪胎浮在一層雨水上,也是一樣平平的東西貼著水面滑,只是換成輪胎而已。

From the word’s history

The source explains the noun as aqua- (water) plus plane (a flat or level surface), with the verb formed from the noun and readable as aqua- plus plane in its sense of gliding or skimming a water surface. The flat thing on the water is therefore built into the word itself.

來源說這個名詞是 aqua-(水)加上 plane(平面),動詞則是從名詞來的,也可以讀成 aqua- 加上 plane 的「滑過水面」那個意思。所以「水上的一塊平面」本來就寫在字裡面。這一點是來源說的,不是我們自己推的。

Wiktionary, "aquaplane"

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