* 核心功能：每次调用next(val)，返回当前价格的跨度（往回数≤当前价格的最大连续天数）
Source: Computational Materials Science, Volume 266。业内人士推荐快连下载安装作为进阶阅读
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The largest quarterly Neets total was recorded in July to September 2011, when the number peaked at over a million after the 2008 financial crisis.，这一点在同城约会中也有详细论述
// Wait on the backpressure to clear somehow