Parse command plural id list
parse_command_plural_id_list - returns a list of names to the parser
string * parse_command_plural_id_list();
This routine is used to find out what plural nouns the object responds to, and is used by the parsing package and the parse_command() efun. In addition, anything returned by the master object will work on ANY object. 提示：这个方法应该放在MASTER_OB中。 This should return a list of plurals that match any object in existence. Again this apply is called once only and never again.