casing spring

例句：

1. 1. The new car hasa casing spring that is designedto reduce noise and vibration.
   这款新车的外壳弹簧设计用来减少噪音和振动。
2. 2.The old house had a casingspring that was rusted through.
   那所旧房子有一个生锈的外壳弹簧。
3. 3. Theengineer replaced the casing spring witha new one to improve the performance ofthe machine.
   工程师用一个新的外壳弹簧替换了原来的，以改善机器的性能。