froth floatation

例句：

1. 1. The milk had turned into a thick, frothy layer on top of the pan.
   牛奶变成了厚厚的泡沫层，覆盖在锅上。
2. 2. The foamy bubbles rose to the surface and burst.
   泡沫般的气泡升至表面并破裂。
3. 3. The frothy coffee was cold and refreshing.
   这杯泡沫咖啡冷而清新。