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A bridgehead is a strong position an army has taken far forward in enemy land — often just after crossing a river — from which it can hold on and then push forward or attack. The picture is: you have crossed, and now you have a piece of ground in your hands, like the near end of a bridge. It is a serious military word, used in news and history. People also stretch it: a company might talk about a bridgehead in a new country, meaning a first office or first customers from which they hope to grow. That is the same idea, moved out of war. It is not the top of a bridge, and it has nothing to do with the card game.
橋頭堡
原始詞典資料4 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。
bridgeheadnoun/ˈbɹɪd͡ʒhɛd/
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An area around the end of a bridge.
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governmentmilitarypoliticsA fortification around the end of a bridge.
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governmentmilitarypoliticsAn area of ground on the enemy's side of a river or other obstacle, especially one that needs to be taken and defended in order to secure an advance.
- He believed the invasion would happen elsewhere and it wasn't until late in the afternoon and long after the Allied forces had established a bridgehead that Hitler was convinced of the need to do something.
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chemistrynatural-sciencesphysical-sciencesEither of the two atoms in different parts of a molecule that are connected by a bridge of two or more other atoms
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。