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。

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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。

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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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The revolt of this class, he thinks, could be the defining characteristic of the election, counting more even than the rise of the (also mostly white, but mostly more affluent) tea-party movement.

ECONOMIST: Lexington