rotating machines的用法和樣例：
例句
- If we know the rotating frequency, we will know each of the componential signals.
如果我們知道了旋轉機械的旋轉頻率，那麼我們也就知道了這些單一頻率。 - Considering rotation machines like a motor, the vibration signals are of universal nonstationarity and the fault samples are usually very limited.
旋轉機械如電機振動信號普遍存在非平穩性，同時對於某台設備已有的故障樣本往往非常有限的。
