froth fire extinguishing system

例句：

1. 1. The milk had a thick layer of foam on top.
   牛奶上面有一层厚厚的泡沫。
2. 2. The bubbles in the drink were caused by the frothing process.
   饮料中的气泡是由泡沫化过程造成的。
3. 3. The chef used a special technique to create perfectly smooth frothed cream.
   厨师使用了一种特殊的技术来制作完美的光滑泡沫奶油。