不定冠词a(an)和数词one都可以修饰单数名词 ,表示“一”或“一个”。a着重指类别 ,表示同类事物中的任何一个 ,有泛指的意义 ,翻译时不一定译出 ;one着重找指数量 ,是与two ,three等数词相对而言的。例如 :Shehasaruler .她有 (一把 )尺子。 (重点指尺子 ,而不是其它什么东西 The indefinite article a(an) and the number one can both modify singular nouns to mean “one” or “one.” A refers to the category, which means that any one of the same kind of things has the meaning of a general meaning, which is not necessarily translated when translated; one focuses on the number of fingers, which is relative to two, three and other numbers. Example: Shehasaruler. She has (a) ruler. (Focus on the ruler, not anything else