当能教导的学生学习不理想时，学生导师会感到沮丧，但当这些虚拟学生学习获得成功时，他们会感到愉悦，因为他们能从他人的成就之中获得自豪和满足。
Student tutors feel upset when their teachable students fail, but happy when these virtual pupils succeed as they derive pride and satisfaction from someone else's accomplishment.
当它到达脑部时，脑内啡引发愉悦和快乐的感觉，这解释了人们通常在冬天觉得沮丧的部分原因。
When they reach the brain, endorphins cause feelings of pleasure and happiness, which partially explains why people often feel depressed during winter.
美国科学家的两项最新研究结果显示，笑能使人精神愉悦，同时还对心脏大有好处；相反，心情沮丧则不利于身体健康，甚至会增加早死的危险。
Laughter is good for the heart because it prolongs life while depression increases the risk of an early death, according to two new studies.
美国科学家的两项最新研究结果显示，笑能使人精神愉悦，同时还对心脏大有好处；相反，心情沮丧则不利于身体健康，甚至会增加早死的危险。
Laughter is good for the heart because it prolongs life while depression increases the risk of an early death, according to two new studies.
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