fast-vibration direction

例句：

1. 1. The fast-vibration direction of the machineis crucial for its operation.
   机器的快速振动方向对其运行至关重要。
2. 2. The vibrationdirection of the engine iscritical to its performance.
   发动机的振动方向对其性能至关重要。
3. 3. The engineer adjustedthe fast-vibration direction tooptimize the machine's efficiency.
   工程师调整了快速振动方向，以优化机器的效率。