| Share | Phrase |
|---|
| 31.44% | precipitation [does] harden |
| 14.43% | harden material [perform operation] |
| 12.61% | harden resin [perform operation] |
| 12.17% | harden steel [perform operation] |
| 10.30% | harden case [perform operation] |
| 7.08% | material [does] harden |
| 6.14% | harden surface [perform operation] |
| 4.34% | partially [degree] harden |
| 1.45% | not harden |