First all, some kind of primary energy source must be available.

首先, 一些主要能源的来源必须是有效而能被利用的.

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Most primary energy sources are converted into electricity to meet relentless demands.

大多数一次能源被转化为电能,以满足对能源的迫切需求.

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Meanwhile, the use of primary energy sources destroys badly our country's environment.

同时由于一次能源的使用使我国环境遭到了很大的破坏.

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The FE Series desktop fans are fans of consistency , low - noise, primary energy consumption, generous appearance.

FE系列台式电风扇具有结构坚固 、 美观 、 噪声低 、 能耗小等特点.

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