The by-product gas of producing of traditional coking technique belongs to the gas of easy burning.

传统焦化工艺产生的副产品煤气属易燃气体。

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Unfortunately the batteries also gave off hydrogen gas as a chemical by-product, which diffused into the body.

更糟糕的是这些电池会释放化学反应的副产品氢气，氢气会被身体吸收。

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The most potent greenhouse gas is HFC-23, a by-product of HCFC-22, a chemical used in, among other things, fridges.

温室效应最强的其他十三氟甲烷(HFC - 23)，是用于冰箱制冷的化学物质HCFC - 22的副产品。

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Such wells yield plenty of gas as a by-product.

ECONOMIST: Shale gas is giving a big boost to America��s economy

United Utilities is converting a by-product of waste water at its Blackburn plant into gas.

BBC: United Utilities turns human waste to energy at plant

The Soviet Union developed formidable expertise in the art of assassination, and (as a by-product of its germ-war and poison-gas efforts) in making toxins.

ECONOMIST: Assassinations and technology