（3）食性的分化（feeding differentiation）：食物对象的分化是一种很常见的现象，一些 亲缘关系很近的、栖息于同一生境的种类，经仔细分析，就可以看出它们之间的食性分化。
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There are several models to explain the occurrence of the phenomena of feeding differentiation, among which "cost of generalism hypothesis" gets more and more experimental support.
广食性代价推动了食性分化的发生，广食性代价假说受到越来越多的实验支持。
It is generally believed that Alticinae and Galerucinae, the specialists, are of recent origin from Chrysomelinae accompanying feeding differentiation which is thought to be important in the process.
一般认为，专食性的跳甲亚科和萤叶甲亚科是由食性较广的叶甲亚科进化而来的，食性分化在其中可能起了重要作用。
Makes the approximate calculation by the use of differentiation, and puts forward the simple and easy formula of second feeding in processing gear.
应用微分法作近似计算，推导出了齿轮加工中计算第二次径向进刀量的简易公式。
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