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Vertical sprawl refers to the unplanned addition of a large number of high-rise buildings in a relatively small area, leading to problems with traffic, parking, and infrastructure, as well as lessening culture and quality of life.

Vertical sprawl指在一個相對較小的區域內雜亂無序地增建大量高層建筑，從而導致交通、停車、基礎設施等方面的問題，同時還會削弱社區文化并降低生活質量。我們稱之為“垂直擴張”。

This phrase is based on its horizontal cousin, urban sprawl, which the OED defines, tidily, as "the uncontrolled expansion of an urban area into the surrounding countryside," and traces back to 1934. (Source: Word Spy)

這個詞是在表示水平擴張的短語“城市擴張”（urban sprawl）基礎上演化而來的，牛津英語詞典對“城市擴張”的定義為“城市向周邊農村無序擴張”，該詞的使用可以追溯到1934年。