em dash meaning in Chinese

长破折号
破折号

There is also a standard set of named character entity references for commonly used symbols outside of some character encodings , so one can use & mdash ; , for example , to represent an em dash ? like this ? in text even if the character encoding used doesn ' t contain that character
也有一些字符集标准将一些常用的标志存放在字符内码外面,那么你可能使用? ，例如,象这样使用文本来表示一个长划（ ? ）的情况，即使它的字符内码已经被使用，这些标准也不包含那个字符。