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龐然大物；巨無霸
A leviathan is something which is extremely large and difficult to control, and which you find rather frightening.
例句
Democracy survived the Civil War and the developing industrial leviathan and struggled on into the twentieth century.
民主經歷了內戰和龐大工業體系的逐漸興起仍然幸存了下來，并且艱難挺進了20世紀。