支序学派之所以忽视进化级的存在是因为按进化级概念处理就容许确认“并系”分类单位（paraphyletic taxa）。按支序学派的术语，一个单系群如果不是“全系”的（holophyletic），即不包括某一共同祖先的全部后裔，就是“并系”的。
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结论：应加强对食品生产企业特别是小作坊类单位的卫生监督监测和卫生知识宣传。
Conclusions: we should strengthen hygiene supervision and law execution in companies which producing pastry food, especially in small companies, for improving pastry food hygiene and safety.
本文讨论了分式线性变换不动点理论，并证明了一类单位圆到单位圆的分式线性变换仅有实不动点。
Some fixed point theory of fractional linear transformation is discussed and it is shown that one kind of transformation from unit circular to unit circular has only some real fixed points.
这个类提供的方法可以用于通过标准的数学转换（比如 1 分钟 = 60 秒，1 天 = 24 小时），将时间跨度转换为标准单位（比如秒、分和小时）。
Methods on this class can be used to convert to standard units such as seconds, minutes, and hours, using standard mathematical conversions (such as 60 seconds in a minute and 24 hours in a day).
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