Becoming a billionaire takes a mixture of smarts, ambition and luck. Here's a look at a few other traits that certain clusters of billionaires share.

想要成为亿万富豪，天赋、抱负和运气缺一不可。下面就来看看这些亿万富豪都有着哪些共同特性：

Parents Had Math-Related Careers

父母从事数学相关职业

The ability to crunch numbers is normally a key to becoming a billionaire. Often, mathematical prowess is hereditary. Some of the most common professions among the parents of American billionaires for whom we could find that information were engineer, accountant and small-business owner.

消化数字的能力通常是成为亿万富豪的关键因素之一。数学才能是可以遗传的。在美国超级富豪的父母们所从事的职业当中，最常见的是工程师、会计和小企业主。

September Birthdays

九月出生者众多

Of the 380 self-made American tycoons who have appeared on the Forbes list of the World's Billionaires in the past three years, 42 were born in September--more than in any other month. Maybe that's because September is the month the Forbes list of the 400 richest Americans is published.

在《福布斯》全球富豪排行榜的380位白手起家的美国亿万富豪中，有42人出生于9月，这是亿万富豪最多的月份。这可能是因为福布斯美国富豪榜400强在九月发布的缘故。

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