橫著架上去的那一根
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any bar across something · noun
Any bar fixed across something from one side to the other, such as a bar that holds a door shut or the bar through the top of an anchor.
橫桿；橫檔
The whole word is on the outside: cross plus bar, one bar lying across from one side to the other. Stand two uprights in the ground, lay a bar over them, and you have the shape. Every meaning of the word is that same bar, seen in a different place.
這個字的意思就寫在字面上：cross（橫過去）加上 bar（桿子）。可以想成把兩根東西立起來，再拿一根桿子橫著架上去。那個形狀就是 crossbar。它通常在做三件事的其中一件。把兩邊撐開、把兩邊接住、或者把路擋起來。球門上面那一根、腳踏車上從坐墊接到龍頭那一根，都是同一根桿子出現在不同的地方而已。
From the word’s history
From Middle English crose bar: cross- plus bar. The compound still says exactly what the thing is.
這個字來自中古英文的 crose bar，也就是 cross- 加上 bar。它是一個到今天都還「看字就懂」的複合字，意思沒有跑掉。
Wiktionary, "crossbar"
One branch