A decade ago most ethylene in North America was made using naphtha, an oil derivative: it is this process that has propylene as its by-product.

十年前，北美的大多数乙烯是石油脑(一种石油衍生物)所制：其生产过程所产生的副产物正是丙烯。

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Business Process Management enabled by SOA: Get complete product information on IBM BPM software, including features and benefits, downloads, and more.

SOA所支持的业务流程管理：获取关于IBM BPM软件的完整产品信息，包括功能和优点、下载等。

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Its fermentation process yields a surprising by-product - plentiful supplies of brewer's yeast.

其发酵过程产生了一个惊人的副产品——充足的啤酒酵母供应。

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The project intends to use a proprietary process employing an in-duct scrubber to reclaim the alkaline clay produced as the primary by-product of the aluminum manufacturing process.

FORBES: Alcoa Could Clean Up With Carbon Capture

They are concerned about the concentrated salt water, a by-product of the construction process, being pumped into the sea.

BBC: Larne Lough gas scheme 'needs other consent'

Rum is made from molasses, a by-product of the sugar refining process.

FORBES: DONQ: LEADING LIQUOR TO SUSTAINABILITY