Inserts the specified string at the specified character offset 从指定的字符偏移量开始插入指定的字符串。
Basically , this is a nested structure that simply gives the character offsets where every production was matched in the source text 这基本上是一个嵌套结构,它只是给出了每个产品在源文本中匹配的字符偏移量。