Three, three, one, the number is 9.

Three three refers to the product in mathematics: that is, three times three to get the number nine.

Three times, three times and nine times.

Look at the stars in twos and threes and dream of Chang 'e.

When the students got married in Jin Lan and became the first place.

Three nights and three nights, Chu Tiankuo is heavy.

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Three spring and three Qiu Xiangse points, wheatgrass is elegant in poetry.

So three three here refers to the number nine, that is, a number is nine.