求翻译：机械振动，如油管细长，弯头多而未加固定，在油流通过时，特别是当流速较高时，容易引起管子抖动；电动机和液压泵的旋转部分不平衡，或在安装时对中不好，或联轴节松动等，均能产生振动和噪声。是什么意思？

Mechanical vibration, such as tubing slender elbow but not more than plus fixed in the oil circulation obsolete, especially when the flow rate is high, easy to cause the tube jitter; the rotating part of the motor and pump imbalance, or installation bad, or coupling loose and so on, can produce vibr