| Share | Phrase |
|---|
| 48.24% | converting [time periodicity] means |
| 10.24% | converting [time periodicity] rotation |
| 9.20% | converting [time periodicity] hydrocarbon |
| 7.91% | converting [time periodicity] energy |
| 7.67% | converting [time periodicity] efficiency |
| 7.32% | converting [time periodicity] fuel |
| 5.38% | converting [time periodicity] mechanism |
| 2.63% | converting [time periodicity] signal |
| 1.36% | substantially [degree] converting |