Happiness can be described as a positive(实在的事物, 确定的) mood and a pleasant state of mind.
A good education and income are usually considered necessary for happiness. But the rich are not necessary to be happier than the middle-income group or even those with very low incomes. People with a college education are somewhat(稍微) happier than those who did not graduate from high school; It is believed that this mainly because they have more opportunities to control their lives. Yet people with a college education may be less happy than those with on college education. Moreover, having good health can be very important to people because they can feel happy and have energy to do what they would like to do. Nevertheless(然而), poor health does not rule out(排除) happiness except for the dying or those in great pain. It should be noted that people quickly get used to what they have, and they are happier when they feel they are increasing their level no matter how little it has be improved..
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