"Their main field, the world's largest producing field, has been in production since 1951," Hamilton told me. "Sooner or later, that's going into decline."

“他们的主要油田，也是世界上最大的油田，自1951年以来一直在开采，”Hamilton告诉我，“迟早有一天，石油产量是要减少的。”

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Some people branch out from their main job to take on consulting work or teach a course in their field.

有些人在自己的主工作外，还做了兼职工作，比如咨询工作或在该领域教授课程。

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Using zinc oxide, the main ingredient in calamine lotion, Young Jun Park, Sang-Woo Kim and their colleagues created a field of nanowires sandwiched between two electrodes.

通过氧化锌，炉甘石洗液中的主要成分，朴勇俊、金相宇以及他们的同事制造出了一段夹在两个电极之间的纳米线。

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But their support was spread among a fractured GOP field, and their main standard-bearer, former Massachusetts Gov. Mitt Romney, quit the race after a disappointing showing in February's Super Tuesday primaries.

CNN: McCain wins GOP nomination; Huckabee bows out

Their main function is to intercept Iraqi Scud missiles and to protect infantry and other assets in the field.

CNN: Weaver: Creature comforts scarce, but soldiers get their mail