1. Synonym and antonym relations are symmetric relationships as well. ͬ��ʺͷ���ʹ�ϵҲ�ǶԳƹ�ϵ��
2. Schaefer model The basic form of production model in which the relation between yield and effort takes the form of a symmetric parabola. Ѧ��ģʽ����ģʽ�Ļ�����ʽ������������Ŭ��֮��Ĺ�ϵ���棬ȡ�ԶԳ������ߵ���ʽ��
3. In this paper, using the fundamental theorems about the existence of the characteristic value of the symmetric integral equation, we prove another two important theorems. �������öԳ�ʽ��������ֵ���ڻ�������֤���˹��ڶԳ�ʽ���ַ�������ֵ�����Ե�������Ҫ���ۡ�
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adj.
1. having similarity in size, shape, and relative position of corresponding parts