surds with same order

例句：

1. 1. The milk had turned intoa thick, white, bubbly liquid.
   牛奶变成了浓稠的白色泡沫状液体。
2. 2. The bubbles burst and thewater flowed back into the pool.
   气泡破裂，水又流回泳池。
3. 3. The foamon the surface of the milk was asign that it had been sitting for toolong.
   牛奶表面泡沫的存在意味着它放置时间过长了。