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Because of longer life spans, Americans are also boosting their savings to preserve their nest eggs, the TD Ameritrade study showed, which surveyed 2,000 adults between 40 to 79.
德美利证券的这项研究调查了2,000名40至79岁的成年人，结果显示，由于寿命延长，美国人也在增加储蓄以保住他们的养老金。
In addition, new digital technologies have allowed more rapid trading of equities, quicker use of information, and thus shorter attention spans in financial markets.
此外，新的数字技术使股票交易更加迅速、信息使用更加快捷，从而使金融市场的关注周期变得更短。
Within the span of a hundred years, in the seventeenth and early eighteenth centuries, a tide of emigration — one of the great folk wanderings of history — swept from Europe to America.
在17世纪和18世纪初的一百年间，一股移民潮——历史上伟大的民族迁徙之一——从欧洲席卷至美洲。