优点： 梯度连续，优化更稳定。
Web streams do provide clear mechanisms for tuning backpressure behavior in the form of the highWaterMark option and customizable size calculations, but these are just as easy to ignore as desiredSize, and many applications simply fail to pay attention to them.，推荐阅读搜狗输入法下载获取更多信息
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"""抓取并处理单个详情页"""
The affordability crisis is over, Donald Trump told the US on Tuesday. The president’s state of the union address put the blame for soaring prices squarely on the “dirty, rotten” lies of the Democrats and claimed prices were now “plummeting downward”.，详情可参考safew官方下载
1. 根据数据范围创建若干个桶