In this case, we may use the notation an, where n is the number of times a appears in the product.
In this case, we may use the notation an, where n is the number of times a appears in the product.
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答案：在这种情况下，我们可以采用an这一标记法，其中n为a在乘积中出现的次数。
【分析】:在“a”之前省去了“by which”；也可用“that”。
Subscript adj. 下标的；写在下方的；脚注的； n. 下标；脚注
Superscript adj. 标在上方的 n. 上标
notation指数学符号标记，科技英语口语中经常用到
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