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龐然大物；巨獸
If you refer to something as a behemoth, you mean that it is extremely large, and often that it is unpleasant, inefficient, or difficult to manage.
例句
The city is a sprawling behemoth with no heart.
這座城市無計劃地向外擴展著，成為一個中心缺失的龐然大物。
...his behemoth 1,047 page book.
他厚達1,047頁的皇皇巨著