scale removal

• 除鳞,清除氧化皮,除水垢,除锈

scale removal的用法和样例：

例句

1. Flush dirt and scale from supply pipe.
   冲洗供应管道内的污物和水垢。
2. The scale on the surface of the kettle has sloughed off.
   壶内的水垢结硬后脱落了。