1. Mutual Factor is divided into mutual space/distance factor, mutual intercourse frequency factor, mutual similarity factor, mutual complementary factor and mutual adoration factor. ˫���������ر��ֳ�˫���ռ�������ء�˫������Ƶ�����ء�˫���������ء�˫���������غ��������أ�
2. It mainly exists historical factors: foreign factor, social factor, cultural factor, market factor, political factor, legal factor and so on. �������ԭ���Ƕ��ģ���Ҫ����ʷ���ء��������ء�������ء��Ļ����ء��г����ء��������ء��������صȡ�
3. Paper use causal relationship test method has proven causal relationship between the variables and establish error correction model. �������ø����ܼ��鷨֤���˱���֮����������ϵ���������������ģ�͡�
4. Between the different ornaments there is no causal relation. When you re-melt an ornament to make another, there is no causal relation between the two. ��ͬ�Ľ���֮�䲢�ޱ�Ȼ�Ĺ�ϵ�����㽫һ�������ۻ��ٴ�����һ��������֮��Ҳû��Ȼ��ϵ��
5. All the causal reasoning can only be rationally justified on the basis of the assumption of an immutable causal order but cannot be justified by reference to evidence by empirical investigation. ���е��������ֻ����һ����������˳��ٶ�Ϊ�������������жϣ������ο�ʵ֤�о���֤�ݽ����жϡ�