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庞然大物；巨兽
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.
这座城市无计划地向外扩展着，成为一个中心缺失的庞然大物。
...his behemoth 1,047 page book.
他厚达1,047页的皇皇巨著