通过引入应力复数和应变复数的概念，提出了平面应力分析和平面应变分析的复数方法。

Complex number method for plane stress analysis and plane strain analysis is proposed by means of introducing the concepts of stress complex number and strain complex number in this paper.

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Ruby on Rails强化了类是单数而表是复数的概念，这减少了程序员的工作量。

Ruby on Rails enforces the notion that classes are singular, and tables are plural. This reduces the amount of work programmers need to do.

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文章提出应力复数、应变复数和惯性复数的概念，得到一个复数方程式，即复数莫尔圆方程。

The concepts of stress complex number and strain complex number and inertia complex number are presented in this paper.

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