These handlers can perform any number of tasks, including calling a service, setting a value on a class, calling a method on a class, or dispatching another event.

这些事件处理器可以执行任何数量的任务，包括对某项服务的调用，对一个类中某个值的设定，对一个类中某个方法的调用，或者分发另一个事件。

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Each method has a name, a number of parameters, and a return value.

每个方法有一个名字、若干参数和一个返回值。

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When determining empirical formula with test method, estimation value of estimated parameter in regression equation which is obtained with least square method always is a long number.

用实验方法确定经验公式时，回归方程中用最小二乘方法求得的待估参数的估计值往往是一个很长的数。

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