帮忙看看这个句子咋理解? the first pumping cell exerts an oxygen pumping action against the first measurement chamber to adjust the oxygen concentration in the gas under measurement within the first measurement chamber to a given level. against-----根据,依据 the first pumping cell根据第一测量室(的测量结果)用氧气泵来调节该室被测气体的氧含量至某值。查看更多