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The M25 is the that makes a huge ring around London. Some road signs also call it the London Orbital — orbital here just means “going around.” It does not take you into the middle of the city; it sits outside, so drivers use it to pass from one side of London to the other without crawling through the centre. British people know it, almost as a joke, for traffic jams: long lines of cars that stop moving, especially in the morning, in the evening, or after a crash. “Stuck on the M25” is a very ordinary British complaint. Like the M1, this is a name, not a general word for every ring road.
M25（倫敦外環高速公路；路牌上有時寫 London Orbital）
組成M is the British label for a motorway; 25 is this road’s number. Orbital on some signs just means it goes around London.
原始詞典資料2 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。
M25name
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An orbital motorway surrounding Greater London, notorious for its general congestion.
- DCI Tom Barnaby: And so the empty bottle in his hand? Dr George Bullard: Should've contained heart pills. Arteries like the M25.
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The notional border between London and the rest of the UK.
- Under the Communications Act 2003, all the commercial public service broadcasters are therefore required to commission certain levels of network programming from outside the M25 by value and volume.
- That's quite an achievement, I think, for someone inside the M25 to travel north, especially someone with such a plummy accent.
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。