hydroscale

例句：

1. 1. The machine was covered in hydroscale after years of use.
   这台机器使用多年后覆盖了一层水垢。
2. 2.The chemical process removes the hydroscale from the water.
   化学过程可以去除水中的水垢。
3. 3. The engineer inspected the equipment for any signs of hydroscale buildup.
   工程师检查设备是否有任何水垢积聚的迹象。