machine coating

例句：

1. 1. The machine coating on the metal surface is very smooth and shiny.
   金属表面的机械涂层非常光滑且闪亮。
2. 2.The manufacturer uses a special machine coating process to enhance the durability of the product.
   制造商使用一种特殊的机器涂层工艺来提高产品的耐用性。
3. 3. The engineers developed a new machine coating technology that can significantly improve the performance of the equipment.
   工程师们开发了一种新的机器涂层技术，可以显著提高设备的性能。