求翻译：以一定时期的不变价格为标准计算的国际贸易额称为国际贸易量。具体计算方法通常选择某一固定年份为基期，以基期计算的报告期出口或进口价格指数去除报告期的出口额和进口额，得出国际贸易量。是什么意思？

A certain period of constant prices calculated as the standard international trade as international trade. The calculation method is usually selected as a fixed base year to calculate the base period of the reporting period, the export or import price index to remove the reporting period, exports an

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Is called the international volume of trade take the certain time fixed price as the standard computation international volume of trade.The concrete computational method chooses some fixed year is usually a base period, by the base period computation current period exportation or the import price in

To be calculated at constant prices for a certain period standard known as the volume of international trade in international trade. Specific calculation methods are usually selected based a fixed year, calculated on a base period of export or import price index removal period of exports and imports

Regard fixed price of a regular period as international volume of trade that standard calculate call the international volume of trade. Concrete computing technology it chooses to be base period in a certain fixed year usually, export or import price index remove volume of export and import volume o