Such systems trade expressiveness for performance - when well engineered, they exhibit very high scalability in both the number of queries and the stream rate.

这种系统用可表达性换取性能。当精心设计时，它们在查询数量和流率上表现出非常高的可扩展性。

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A mathematical model that characterizes the affects of the updating cycle of sliding window and data stream rate on predictive accuracy is also presented.

还提出了滑动窗口的更新周期、数据流的流速对预测精度影响的数学模型。

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The price is just the present value of that stream, discounted at the interest rate.

债券的价格就是这些现金流,以利率r为贴现率算出的贴现值

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Unlike the data we use to surf the Internet and check our e-mails, which can be slowed down and not affect the results, streaming video services need to be able to stream at a certain data rate and while some dropped packets can be tolerated, at some point the movie becomes jerky on the screen, and sometimes entire sections drop out.

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The problem lies in the uncertainty surrounding both its components: the future stream of dividends and the appropriate discount rate.

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True, stocks will remain volatile, but a healthy income stream, especially in a historically low interest rate environment, can lead to more peaceful slumber.

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