它还可以采取动作；当解析器达到表达式中的那个条件点时，封装在中的代码块将会被执行。
It can also take actions; blocks of code enclosed in pairs will be executed when the parser reaches that point in an expression. For instance, one might write.
该模型的连续性证明的表达式“周期性波动”和“商业周期”，虽然动作既不恒定的持续时间也不恒定的长度。
The continuous character of this model justifies the expressions' cyclical fluctuations' and 'business cycle' although the movements have neither constant duration nor constant length.
对于含有弹簧-阻尼器-动作缸组件，或者扭簧-阻尼器-动作缸组件的系统，文中载有这些组件合力的表达式。
The expressions for the resulting forces from spring-damper-actuator or torsional spring-damper-actuator elements were also presented in this paper.
通过对该方法的研究，揭示了目前常用的基于故障分量的距离继电器的通用表达式与动作特性，对比了这几类距离继电器在可靠性与灵敏性上的差异。
By the research, the paper explains the essence and the character of several types of common-used fault-component based distance relay, compares their difference in the reliability and sensitivity.
通过对该方法的研究，揭示了目前常用的基于故障分量的距离继电器的通用表达式与动作特性，对比了这几类距离继电器在可靠性与灵敏性上的差异。
By the research, the paper explains the essence and the character of several types of common-used fault-component based distance relay, compares their difference in the reliability and sensitivity.
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