事实上陈省身教授在Euler示性数以及更广义的所谓示性类(characteristic class)方面的工作即现在所谓的陈类(Chern class)的光辉成就，在这时已经逐渐孕育和形成了。
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arithmetic characteristic class 算术的特性类
characteristic class of a manifold 流形的示性类
secondary characteristic class 二阶示性类
characteristic class of manifold [数] 流形的示性类
Chern characteristic class 陈示性类
theory of characteristic class 示性类理论
symplectic pontryagin characteristic class 辛Pontryagin示性类
class characteristic 一般特征
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以上来源于: WordNet
Usually, an income of that size requires regular, formal employment, with a salary and some benefits, that is, a steady job-another key middle-class characteristic.
通常，那种水平的收入需要一个固定正式的职业，有工资和保险，即一份稳定的工作——这是中产阶级的另一个关键特点。
According to the characteristic of current information technology class, this paper analyzes several attributes of game CAI, generalizes its main characteristic and describes them in detail.
本文根据当前信息技术课堂的特点，分析了游戏式CAI所应具有的属性，归纳其主要特征并对其进行了详细描述。
An extracting rules algorithm based on class feature matrix is presented, which has made use of the characteristic of discernibility matrix.
充分考虑了可辨识矩阵的特性，提出一种基于类别特征矩阵的决策规则提取算法。
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