I began thinking that there's got to be a way to harness all the energy of an ocean swell, in a practical and efficient way, in a responsible way.

我开始想，应该能找到一种实用、有效而负责任的办法，来驾驭海洋潮汐的能量。

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The results show that the algorithm is practical and efficient.

结果表明，算法实用高效。

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The experimental result shows that the information service system proposed in this paper is practical and efficient.

实验表明，该文提出的信息服务系统是实用有效的。

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Leonhardt said it would be more practical to use solar power to help charge a car's battery and use the more efficient panels mounted on a roof or over a parking area to supply the rest of the electricity needed to drive the engine.

CNN: Solar cars still a way off