| Share | Phrase |
|---|
| 22.93% | unidirectional [direction] valve |
| 20.65% | unidirectional [direction] means |
| 10.46% | unidirectional [direction] magnet |
| 9.42% | unidirectional [direction] flow |
| 6.97% | unidirectional [direction] voltage |
| 6.27% | unidirectional [direction] output |
| 5.13% | unidirectional [direction] rotation |
| 4.18% | unidirectional [direction] input |
| 3.78% | unidirectional [direction] tooth |
| 3.66% | unidirectional [direction] path |
| 3.57% | unidirectional [direction] device |
| 2.91% | unidirectional [direction] motion |