| Share | Phrase |
|---|
| 49.82% | prolong life [perform operation] |
| 12.84% | prolong period [perform operation] |
| 10.01% | prolong time [perform operation] |
| 5.96% | prolong duration [perform operation] |
| 5.46% | side [temporal] prolong |
| 2.33% | prolong cycle [perform operation] |
| 2.18% | prolong modal can |
| 1.94% | prolong interval [perform operation] |
| 1.77% | prolong discharge [perform operation] |
| 1.32% | prolong supply [perform operation] |
| 1.26% | result [resume] prolong |
| 1.05% | prolong part [perform operation] |
| 0.98% | example [example] prolong |
| 0.94% | means [does] prolong |
| 0.86% | prolong modal may |
| 0.76% | prolong modal will |
| 0.46% | not prolong |