环境对鱼体的各种刺激，即为环境胁迫因子（Environment stress factor）：这种胁迫对鱼类可能足致死性的，即使是亚致死性的胁迫，对鱼类也足以引起应激反应（Stress）。
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The main external factor of solder joints degradation or deviation from an expected normal condition is the time stress such as work and environment stresses.
焊点所承受的各种环境应力和工作应力的时间历程（时间应力）是其疲劳失效的直接外因。
Results Factor analysis indicated that the subjects mainly perceived stress from"Worrying about current academic and future work", "Personnel relation-ship and environment stress"and"Study stress".
结果大学生心理压力主要为“对学业和未来工作的担心”、“人际与环境压力”和“学习压力”。
Early-weaning piglets are easy to be affected by physiology, nutrition and environment, which resulted in stress and abnormal growth, in which, nutrition is the most important factor.
早期断奶仔猪易受生理、营养和环境的影响产生应激，影响其正常生长，其中营养因素最为重要。
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