The predictions are based on an online survey of U.S. residents, whose answers are weighted based on factors including education, income, and geography.

预测是根据一份对美国居民的在线调查，考虑他们的教育、收入和地理因素后得到的。

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Students attend after-school clubs, summer camps, online forums and classes, and university-based "math circles", to prepare for the competitions.

学生们参加课外俱乐部、夏令营、在线论坛和课程，以及基于大学的“数学圈子”，来为比赛做准备。

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Fidelity had in recent years snagged market share from Wall Street giants like UBS and Morgan Stanley as investors flocked to more affordable, online-based services during the recession.

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By migrating to an online-based system, the city not only successfully hosted the convention, but now has a permitting system in place that continues to pay dividends in supporting other major events held in the city annually, helping attract tourism and economic investment.

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"When a woman or man loses a spouse, that one person is living a life that was built for two, " says Ellen Kamp, who co-founded the W Connection, an online-based support group, which provides information on its website aimed at helping widows navigate these challenges.

WSJ: Money Issues of Surviving Spouses