froth flotation process

例句：

1. 1. The milk had turned into a frothy mess on the table.
   牛奶变成了桌上的泡沫状混乱。
2. 2. The foam was so thick that it covered the surface of the water.
   泡沫很厚，覆盖了水面的表面。
3. 3. The frothy coffee was delicious and refreshing.
   这杯泡沫咖啡既美味又提神。