it just works. no special machinery needed. the boolean operators distribute over derivatives the same way union does. derivatives are such a powerful and interesting tool that i will dedicate a separate post to them, but the main point is that they give us a simple and uniform way to handle all regular language features, including intersection and complement.
Одному из российских рынков предсказали рост до полутриллиона рублей15:00
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近几年，田里陆续增添气象监测仪、田间24小时监控器等物联网智能设备，让虫情、墒情、气温数据实时回传，为水稻生长精准“画像”。
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