发泡

例句：

1. 1. The milk has foamed upin the bottle.
   牛奶在瓶子里起泡了。
2. 2. The beer foamed up whenit was poured into the glass.
   啤酒倒入玻璃杯时起泡了。
3. 3. When youput a little oil in the pan,it will foam up.
   当你把一点油放在锅里，它会起泡。