1. Stress prompts the body to produce certain stress hormones. ѹ����ʹ�������һ����ѹ���ɶ��ɡ�
2. In certain areas of North China there was also the risk of attack by bandits who preyed on unsuspecting travelers. ���й����ﱱ����ij������Ҳ�ǽ��������ɵ��ÿ����ϲ�ʳ��ǿ��������Σ�ա�
3. As far as the laws of mathematics refer to reality, they are not certain; as far as they are certain, they do not refer to reality. ����ѧ�������漰��ʵ�����ж��ԣ������Dz�ȷ���ģ������ǵ�ȷ������˵�����ǾͲ����漰����ʵ�����С�
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adj.
1. definite but not specified or identified
2. having or feeling no doubt or uncertainty; confident and assured
3. established beyond doubt or question; definitely known
4. certain to occur; destined or inevitable
5. established irrevocably
6. reliable in operation or effect
7. exercising or taking care great enough to bring assurance
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Certain ij��ijЩ��ȷ���ģ�һ����;
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make certain (�ѡ�)Ūȷʵ��Ū���;
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