The key is to not crash your program or throw an exception that stops processing.

关键是不使程序崩溃或抛出异常而中止处理。

youdao

There were two options for what should happen when the retrieval timeout occurs: return null or throw an exception.

对于在检索超时发生时应当发生的事情，有两个选择：返回null或者引发异常。

youdao

In this class, you manipulate the server data and return a value to the client (or throw an exception, but let's stay optimistic for the moment).

在这个类中，将操作服务器数据并将值返回给客户机(或者抛出异常，但是此刻先让我们乐观一些认为不会出现这种情况)。

youdao

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