1. The text '|' is not valid because a quotation mark is not matched. Make sure every opening quotation mark appears with a closing quotation mark . 文本“|”无效,因为有一个引号不匹配。每个左引号都要有右引号。
2. Single quotation marks are usually reserved for setting off a quotation within another quotation. 单引号通常用来凸现一个在另一个引号里面的引号。