慢速英语:美国可能成为世界顶级石油生产国

音频下载[点击右键另存为]

同步字幕下载[点击右键另存为]

consume - v. to use (fuel, time, resources, etc.)

efficient - adj. capable of producing desired results without wasting materials, time, or energy

barrel - n. a round usually wooden container with curved sides and flat ends