mammoth [ˈmæməθ]

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n.长毛象；adj.长毛象似的，巨大的

extremely large

You can only undertake mammoth changes if the finances are there. 资金到位的情况下方可进行重大变革。
Building the new railroad will be a mammoth job. 修建那条新铁路将是一项巨大工程。