简单地换上一张快乐的脸，正如古典的抒情歌曲建议的，就能创造差异。
Simply putting on a happy face, as the classic song lyric advises, can make a difference.
国家大剧院相关负责人表示，希望把音乐传播到城市的街头小巷和千家万户，让它在整个城市中成为一个无处不在的存在，让古典音乐回归快乐与自然。
"We hope to send music to all the streets and windows, making the classical art omnipresent in a city immersed in a happy and relaxing atmosphere," a senior official of the NCPA said.
快乐与痛苦是亚当·斯密古典经济学发生的最初起点。
Happiness and pain are the star ting points of Adam Smith's classical economics.
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