it is usually measured by the percentage of change in a country's gross domestic product(GDP):the annual market value of all goods and services produced by all firms and organizations,foreignand domestic,operating within a country.
通常這個數據是由國家的GDP(國內生產總值)百分比的改變量所測出來的:每年一個國家裡 貨物跟服務的市場價值是由國內外的產業和團體組織所產所制定的
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