Nine is usually thought of as a lucky number because it is the product of three times three.

9通常被认为是一个幸运数字，因为它是3乘以3的乘积。

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Nine is usually thought of as a lucky number because it is the product of three times three.

9通常被认为是一个幸运数字，因为它是3乘以3的乘积。

youdao