Extensions are not a required feature of the grammar and, thus, their syntax is not as well defined as the other constructs of the language.
扩展并不是文法必需的特性，因此它们的语法不象该语言的其它构造那样得到良好定义。
Extensions are not a required feature of the grammar and, thus, their syntax is not as well defined as the other constructs of the language.
扩展并不是文法必需的特性，因此它们的语法不象该语言的其它构造那样得到良好定义。
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