There are actually two types of validation error messages - those generated before the HTML form fields are bound to a class and those generated after the form fields are bound to the class.

实际上有两种错误消息类型：在捆绑html表单的时候根据类型生成的，和提交后表单元素绑定的类生成的。

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The target Web service invocation may lead to an error, of which there are two types

目标 Web 服务调用可能导致两种类型的错误

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So we make two types of errors: a type I error, or false positive, is believing a pattern is real when it is not; a type II error, or false negative, is not believing a pattern is real when it is.

因此我们常犯两类错误：第一类，是虚假的肯定，当原型并不存在时它认为原型是真的；第二类，是虚假的否定，当原型存在时它却认为原型是虚假的。

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