Data from representative national surveys conducted from 1981 to 2007 show the happiness index rose in an overwhelming majority of nations studied, according to WVS.是什么意思_Data from representative national surveys conducted from 1981 to 2007 show the happiness index rose in an overwhelming majority of nations studied, according to WVS.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句