The maximum energy conversion efficiency was 20%.

最高能量转换效率为20%。

Wave energy conversion techniques are qreatly developed.

波能转换技术日趋成熟。

Low heat, electric energy conversion rate in more than 90%.

发热量低，驱动电能转化率在90%以上。

Where: Engines and Energy Conversion Lab (EECL), Colorado State university?

地点：科罗拉多州立大学发动机和能量转换实验室(EECL)？

Rotating electrical machines accomplish electromechanical energy conversion.

旋转器机器完成电机的能量转化。