If you've ever played with soap and water, you've probably played with bubbles. The people in this picture are surrounded by a bubble as tall as they are, but most bubbles are much smaller.
There are lots of ways to play with bubbles. You can blow them, chase them, pop them or even just watch them. One of the most fun parts of watching bubbles is looking at all the different colors. Do you know what gives bubbles their rainbow-like color?
The color of a bubble changes, and different spots on one bubble have different colors. The way the light goes through a bubble can change what color the bubble is. The color of a bubble's wall also changes as the bubble gets thinner or thicker. Where the walls of the bubble are at their thickest, the bubble will look blue-green. As they get thinner, they will turn blue, then a purple-red color, then yellow.
When a bubble gets very, very thin it will become totally clear. When it looks like that, the walls of the bubble are only one billionth of a meter thick! Of course, you won't see a clear bubble for very long. When the walls of a bubble are this thin, it's about to pop.(Kayleen Hartman, Staff Writer)
1. surround v.t.
包圍 (bao1 wei2)
例: Taiwan is surrounded by water.
2. pop v.i. /v.t.
爆破 (bao4 po4)，破掉 (po4 diao4)
例: Ralphie was having fun playing with his balloon until he sat on it and it popped.
3. spot n.
地點 (di4 dian3)
例: Where can we sit? Oh, there's a free spot right over there.