| Share | Phrase |
|---|
| 34.80% | bidirectional [direction] bus |
| 21.53% | bidirectional [direction] switch |
| 8.34% | bidirectional [direction] motor |
| 7.70% | bidirectional [direction] mechanism |
| 7.51% | bidirectional [direction] pump |
| 6.51% | bidirectional [direction] rotation |
| 6.43% | bidirectional [direction] flow |
| 4.12% | bidirectional [direction] interface |
| 3.02% | bidirectional [direction] system |