If after adding a digit or words, then add, until a digits.
如果相加之后还是一位数的话，就再相加，直到变成一位数。
It stands to reason, then, that trying to improve upon perfection by adding a digit is a very bad idea indeed—your greed will be rewarded with bad luck.
然后，由此推理出，想通过增加一个数字来提高完美的程度其实是一个很糟的点子——你的贪婪最终带来了坏运气。
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