noncontacting plunger

例句：

1. 1.The new non-contact pump significantly reduces maintenance costs.
   新型非接触式泵显著降低了维护成本。
2. 2.The engineer used a non-contact plunger to remove the stuck screw.
   工程师使用非接触式柱塞泵来拔出卡住的螺丝。
3. 3. In this case, the non-contact plunger proved to be more efficient than the traditional one.
   在这种情况下，非接触式柱塞泵比传统柱塞泵更有效。