| for the highly efficient fuel cells | 11 | purpose |
| for the future | 9 | transitive-object |
| for the next century | 5 | temporal |
| hydrogen → be → the fuel | 39 |
| hydrogen → be → the fuel of the future | 33 |
| hydrogen → be → fuel | 18 |
| hydrogen → be → the fuel of choice | 11 |
| hydrogen → be → the fuel of life | 7 |
| negative | neutral | positive |
| 0.068 | 0.560 | 0.372 |
| Raw frequency | 108 |
| Normalized frequency | 0.666 |
| Modifier score | 1.000 |
| Perplexity | 26.214 |