foam flame bonding

例句：

1. 1. The foamon the surface of the milk is asign that it has been warmed.
   牛奶表面的泡沫是它已经被加热的标志。
2. 2. Thefoam was so thick that it covered theentire surface of the pool.
   泡沫很厚，覆盖了整个游泳池的表面。
3. 3. The foamrose up and smothered thefish in the tank.
   泡沫上升并淹没了鱼缸里的鱼。