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。
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
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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