浮在水上、撐住重量的中空體
這個家族就是核心畫面本身。差別只在浮筒撐的是什麼：一座橋，還是一架飛機。
noun · B2
One of the flat-bottomed boats or hollow metal floats that are joined together and put in the water to hold up a temporary bridge, a dock, or a landing stage.
浮筒
核心畫面
The picture you can hold for pontoon is a big box, closed on every side, with nothing inside it but air. Air is light, so the box will not go under; put weight on top and it pushes back up. Line a row of these boxes across a river and lay boards over them, and people walk over water. Bolt two of them under a plane instead of wheels, and the plane can come down on a lake. One picture, two places.
pontoon 的畫面可以想成一個大箱子，六面都封起來，裡面只有空氣。空氣很輕，所以箱子沉不下去；在上面壓重量，它還…更多收起
pontoon 的畫面可以想成一個大箱子，六面都封起來，裡面只有空氣。空氣很輕，所以箱子沉不下去；在上面壓重量，它還會往上頂。把一排這樣的箱子橫在河上，鋪上板子，人就能走過水面。把其中兩個裝到飛機底下取代輪子，飛機就能降在湖上。同一個畫面，只是換了兩個地方用。From the word’s history
Recorded as coming through French ponton from Latin pontō, pontōnem (a ferryboat), from pōns (a bridge). The word starts out already carrying both halves of the modern picture: something boat-like that lets you get across.
來源記載它經由法文 ponton，來自拉丁文 pontō（渡船），再往前是 pōns（橋）。這個字一開始就同時帶著「船」和「橋」兩半，正好就是它今天的畫面：用船一樣的東西，讓人過得去。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:589751956)
Two branches
二十一點紙牌遊戲
這個意思不要硬接回浮筒的畫面，它跟水完全無關。兩個字只是拼法撞在一起。
noun · B2
A card game, marked in the source as British English and often played for money, in which you try to get cards that add up to twenty-one, or as near to twenty-one as you can without going over it.
二十一點（紙牌遊戲）