froth flotation

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 so big that they looked like foam.
   饮料里的气泡非常大，看起来像是泡沫。
3. 3. The chef used a special technique to create perfectly frothy cream.
   厨师使用了一种特殊的技巧来制作完美的泡沫奶油。