正確的應該是eighty-one序數詞是eighty-first ，eighty-first中文意思是第八十一
That was where he lived with Sadie Juran， his wife of eighty-one years.這是在他所住的薩迪·朱蘭，他的妻子的八十一年。
Tommy Carter started working on drought-resistant soybeans in nineteen eighty-one.
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