Sentence:  Therefore, what follows is a list of typical output functions; your job is to determine if any of the functions print out tainted data that has not been passed through some sort of HTML <WSD>escaping</WSD> function. 
Meaning of the word marked with <WSD> tags:  To cause (a single character, or all such characters in a string) to be interpreted literally, instead of with any special meaning it would usually have in the same context, often by prefixing with another character.