Income terms of trade: the net barter terms of trade weighted by the volume of exports. It gives an indication of the purchasing power of exports.

收入贸易条件：即以出口额加权的净易货贸易条件，以此表明出口带来的购买力。

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The power generated by moving water is a product of Net Head and Flow Volume (through the water wheel or device).

由流动的水所产生的电力是产品净头和流量(通过水轮或设备)。

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