比如你简单修改变量的类型和方法的名字，这样程序就可以做实数的加法了，如图2 - 3。
You could, for example, change this program so that it added two real Numbers simply by changing the types of the variables and the names of the input methods, as shown in Figure 2-3.
操作：LESS和Sass都支持简单的算术操作，例如加法。将这个特性和变量结合起来，会使得CSS变得更加灵活。
Operations: both LESS and Sass allow for simple arithmetic operations such as adding values, which becomes useful with variables to make CSS files more flexible.
加法操作符的作用是取得变量的值并加1。
The effect of the addition is to fetch that value and add one to it.
利用振型迭加法导出了结构物理参数和作用荷载幅值同时具有随机性时结构动力响应随机变量的数字特征计算表达式，并提出了求解方法。
The randomness of both physical parameters of structure and the amplitude peak of applied load are taken into account in the present model.
利用振型迭加法导出了结构物理参数和作用荷载幅值同时具有随机性时结构动力响应随机变量的数字特征计算表达式，并提出了求解方法。
The randomness of both physical parameters of structure and the amplitude peak of applied load are taken into account in the present model.
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