| Share | Phrase |
|---|
| 11.58% | penetration depth |
| 8.04% | spray penetration |
| 5.78% | poor [amount] penetration |
| 4.70% | penetration force |
| 4.11% | fuel penetration |
| 4.09% | deeper penetration |
| 3.65% | penetration spray |
| 3.37% | gas-tight [tightness] penetration |
| 3.32% | jet penetration |
| 3.13% | prevent penetration [perform operation] |
| 2.96% | weak [evaluation] penetration |
| 2.77% | increased [increase] penetration |
| 2.74% | enhance penetration [perform operation] |
| 2.35% | insulating [physical/chemical] penetration |
| 2.32% | center penetration |
| 2.29% | good [character] penetration |
| 2.24% | penetration extent |
| 2.23% | achieve penetration [perform operation] |
| 2.14% | penetration degree |
| 2.08% | maximum [size] penetration |
| 2.02% | penetration hole |
| 1.81% | have penetration [perform operation] |
| 1.55% | penetration opening |
| 1.46% | low [size] penetration |
| 1.36% | penetration in chamber |
| 1.32% | penetration bore |
| 1.31% | electrically [manner] penetration |
| 1.29% | controlled [functioning] penetration |
| 1.22% | water penetration |
| 1.20% | penetration power |
| 0.99% | penetration pass |
| 0.98% | penetration rate |
| 0.96% | shaft penetration |
| 0.95% | provide penetration [perform operation] |
| 0.92% | permit penetration [perform operation] |
| 0.84% | gas penetration |
| 0.77% | oil penetration |
| 0.76% | reduce penetration [perform operation] |
| 0.64% | produce penetration [perform operation] |
| 0.59% | control penetration [perform operation] |
| 0.56% | air penetration |
| 0.42% | include penetration [perform operation] |