He exercised his ingenuity to devise a time-saving method.

他开动脑筋去想一个节省时间的办法。

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Liquid membrane technique is a simple, efficient and cost-saving method compared with conventional separation and purification techniques.

与传统分离提纯技术相比，液膜分离技术具有简便、高效且成本低的特点。

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Comparing with conventional biochemical product separation and purification techniques, liquid membrane is a simple, efficient, and cost-saving method.

与传统的生化产品分离提纯技术相比，液膜分离技术具有简便、高效且成本低的特点。

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However, researchers from the Massachusetts Institute of Technology (MIT) say they have found a method of recovering oil after a spill using magnets, potentially saving companies like BP money in clean up bills.

CNN: Cleaning up oil spills with magnets and nanotechnology