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| перемещение вперёд-назад (ssn) | |||
| возвратно-поступательное движение (When the air is supplied to the internal cylinder of the actuator, the Piston makes back-and-forth movement and this movement makes those valves and dampers move accordingly. Александр Рыжов) | |||
| back-and-forth movement: 1 phrase in 1 subject |
| Aerohydrodynamics | 1 |