Word processing systems are designed to handle hyphenation in various ways, one of which may call for the use of an exceptiondictionary.
在字（词）处理系统中设计有各种处理连字符的方法，其中的一种需要使用一种 例外字典。
2
If the key doesn't exist in the dictionary, an exception is thrown.
如果在字典中不存在该键，就抛出一个异常。
3
In almost every case (the notable exception being string ), a list function applied to a dictionary behaves as if the function had been passed a list of the values of the dictionary.