* 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）
Even a single night of road traffic noise, at levels that are typical of those living in a city, causes stress to the heart and blood vessels
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Rytr can be used for various purposes, from writing blog posts to creating school papers. You can also generate captions for social media, product descriptions, and meta descriptions.，这一点在爱思助手下载最新版本中也有详细论述
Step through the Python implementation. Watch the algorithm decide which branches to visit and which to prune: