打个简单的比方,“狗有四条腿”成立,反过来“有四条腿的就是狗”显然就是错误的了。
%CD%C1%BA%C0%BD%F0%C6%CB%BF%CB%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
%CD%C1%BA%C0%BD%F0%C6%CB%BF%CB%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
%CD%C1%BA%C0%BD%F0%C6%CB%BF%CB%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
%CD%C1%BA%C0%BD%F0%C6%CB%BF%CB%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF


