anchor.diff:  %%------------------------------------------------------------------------------------------------
   %% Internal.
   %%------------------------------------------------------------------------------------------------
  -get_answer(Question_) ->
  +get_answer(Question_, SessionId) ->
       Question = trim(Question_),
       Url = "http://apis.baidu.com/turing/turing/turing",
  -    Qs = "?key=ae177163c8d16dc28787f8e8badd6e7c&info=" ++ binary_to_list(Question),
  +    Qs = "?key=ae177163c8d16dc28787f8e8badd6e7c&info=" ++ binary_to_list(Question) ++ pid_to_list(SessionId),
       Answer = case httpc:request(get, {Url++Qs, [{"apikey", "864770ce98248d2562b8fecd73e69ef3"}]}, [], []) of
           {ok, {{_Version, 200, _Phrase}, _Headers, Body}} ->
               DecodedBody = jsx:decode(list_to_binary(Body)),
  -	    Code = proplists:get_value(<<"code">>, DecodedBody),
  -	    case Code of
  -	        100000 ->
  -		    proplists:get_value(<<"text">>, DecodedBody);
  +	    	Code = proplists:get_value(<<"code">>, DecodedBody),
  +	    	case Code of
  +	        	100000 ->
  +		    		proplists:get_value(<<"text">>, DecodedBody);
  +	        	40002  ->
  +		    		unicode:characters_to_binary("你想和我说什么?", unicode, utf8);
  +	        	200000 ->
  +		    		Text = proplists:get_value(<<"text">>, DecodedBody),
  +		    		PicUrl = proplists:get_value(<<"url">>, DecodedBody),
  +		    		Title = unicode:characters_to_binary("点我呀!~", unicode, utf8),
  +					<<Text/binary, "\n <a target='_blank' href='", PicUrl/binary, "' >",Title/binary, "</a>">>;
  +				_ ->
  +		    		DecodedBody
  +            end;
   		_ ->
  -		    DecodedBody
  -            end;
  -	_ ->
  -	    <<"I am dead.">>
  +	    	<<"I am dead.">>
       end,
       Answer.
   
  
positive.code: %% API.
  -export([start_link/0]).
  -export([add_robot_to_xnest/2]).
  -export([get_answer/1]).
  
  %% gen_server.
  -export([init/1]).
  
negative.code: handle_info({_From, text, {normal, Msg}}, State) ->
      case Msg of
          <<"@robot", Question/binary>> ->
              Answer = get_answer(Question, _From),
  	    	lager:info("question:~ts, answer:~ts", [Question, Answer]),
              xnest:input(State#state.xnest, {self(), text, {normal, Answer}});
  	_ ->
  