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This type of water comes from underground sources and has low levels of oxygen, yet high amounts of sulphur and other dissolved chemicals.

这类水来源于地下水源，含氧量很低，还含有大量硫和其它化学物质。

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When electricity, whether from photovoltaic cell, wind turbine or other sources, runs through the electrode, the cobalt and phosphate form a thin film on the electrode and oxygen gas is produced.

当电流——无论是来自光伏电池、风轮机还是其它来源——穿过电极时，钴和磷酸盐会在电极上形成一层薄膜，氧气就生成了。

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Fuel cells which produce electricity from the combination of hydrogen and oxygen, would supplement other energy sources and release only water vapour into the environment.

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While no official cause of the crash has been named, sources have told CNN that 150 of the oxygen generators -- improperly packed and stowed in the DC-9's cargo hold -- are believed to have ignited the fire that brought down the plane.

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