1. Stress prompts the body to produce certain stress hormones. 压力促使身体产生一定的压力荷尔蒙。
2. In certain areas of North China there was also the risk of attack by bandits who preyed on unsuspecting travelers. 在中国那里北部的某区域中也是藉着在无怀疑的旅客身上捕食的强盗攻击的危险。
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. 就数学规律能涉及现实生活中而言，他们是不确定的，就他们的确定性来说，他们就不能涉及到现实生活中。
英英解释
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
