external work短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 外功 Turbo- expander is a machine which can produce cooling load by gas swell output external work in air separation equipment. It has much merit, so it could be abroad use in air separation industry. 透平膨胀机在空气分离设备中，是用来使气体膨胀输出外功以产生冷量的机械，由于其具有很多优点，因而在空气分离行业中应用广泛。 cnki