| 单词 | a one | 
| 释义 | A one in American English (ˈeɪ ˈwʌn)  Informal   first-class; first-rate; superior:   also  A 1,  A number 1 Word originorig. a designation of first-class ships, as in Lloyd's Register: A indicating the excellent condition of the hull, 1 that of the equipment Examples of 'A one' in a sentence | 
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