初中英语
If the temperature is low enough, the skin of the bubbles frost
(结霜) over, becoming cloudy instead of clear.And what about
those rainbow swirls(旋涡状物体) that you see in soap bubbles?
The rainbow colors stay even(均匀的) when the bubbles frost,
but they don’t spin (旋转) anymore.The bubbles still float in the
air.They don’t fall to the ground any faster than they would on a
warm summer day.
When these frozen bubbles break, they don’t turn into tiny