* 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）
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第六条 适用一般计税方法的纳税人为一般纳税人。
The hard truth? Raising venture capital too early can cost you control, leverage and even your company. Early capital is often highly dilutive, selling off your future before your blueprint is complete. The difference between lighting a spark and burning your equity to ash is a lesson many founders learn too late.，推荐阅读夫子获取更多信息
A war trumpet was used by Celtic tribes across Europe to intimidate their enemies and to inspire and direct warriors during battle.