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庞然大物;巨无霸
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.
民主经历了内战和庞大工业体系的逐渐兴起仍然幸存了下来,并且艰难挺进了20世纪。