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有人说，幸福是一种感觉，不知足永不会幸福，因此要学会“知足常乐”。
“知足常乐”，汉语成语，意思是知道满足，就总是快乐（A man who is contented will be happy），形容对已经取得的成就感到满足并取得快乐。与英文谚语“a contented mind is a perpetual feast”意思相近，表示“If you are mentally at peace, you will always feel that you have enough of everything, and will not have to strive to get more”。
例句：
A: 莉莲挣的钱不多，但她似乎一直很快乐。我想知道她是怎么做到的？
A: Lillian doesn't make very much money, but she seems to be happy all the time. I wonder how she manages that?
B: 知足常乐。
B: A contented mind is a perpetual feast.
来源：chinadaily.com.cn
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