试题题干
Fill in each of the following blanks with a word or an expression.
If the words or phrases within a string have more than one grammatical relation, then the string，though with no change in combination between words, is characteristic of 
structural ambiguity.
参考答案
试题解析
如果字符串中的单词或短语具有多于一种语法关系，则字符串虽然在单词之间没有组合变化，但却是深层结构歧义的特征。