Throw an exception at run time when there is no matching constructor.

当没有匹配的构造函数时，抛出运行时异常。

youdao

To deal with this, you can generate a stack trace in the constructor of the exception object during the throw exception statement.

为了解决这一问题，可以在抛出异常语句期间，在异常对象的构造函数中生成一个堆栈跟踪。

youdao

When determining what type of exception to throw, you should always first consider the tier that will handle the reported exception.

当决定抛出何种类型的异常时，您应该总是首先考虑将要处理所报告异常的层。

youdao

The format is the same. I'm going to ask for some input, and then I am going to use that procedure to check, is this the right type of value. And I'm trying to use that to do the coercion if you like. Same thing if it works, I'm going to skip that, if it not, it's going to throw the exception.

格式是一样的，我需要一些输入,然后我要用一个过程来检查,是否是正确的值,然后你就可以做强制转换了,如果能运行，那是一样的，我打算跳过这段，如果不正确，那就会抛出一个异常。

麻省理工公开课 - 计算机科学及编程导论课程节选

The NSTextAlignmentNatural value is unsupported and will throw an exception when used with the textAlignment property of UILabel or supplied as the alignment parameter to the drawInRect:withFont:lineBreakMode:alignment: method of NSString.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog