Of course, there are edge cases as well, such as if a user presses the Find word button without having entered a word, or if the user enters an invalid word.
当然，也存在一些极端的例子，比如一个用户按下了Find Word按钮但没有输入单词，或者，用户输入了一个无效的单词。
If any are invalid, the advanced configurations are automatically removed from the pattern, making it then necessary to click the advanced options button and make new choices.
如果存在无效的选择，将自动从模式中删除高级配置，以便在必要时单击advanced options按钮并进行新的选择。
What if the XPath //input[@value='Google Search' and @type='button']became invalid due to changes on the web?
万一因为Web的变化，XPath //input[@value='Google Search' and @type='button']变成无效的了，怎么办？
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