frothing

例句：

1. 1.The milk was foaming over the top of the cup.
   牛奶从杯口冒出泡沫。
2. 2. The hot chocolate was frothing with steam.
   热巧克力冒着蒸汽。
3. 3. The beer was foaming over the side of the glass.
   啤酒从杯子边缘冒出泡沫。