You all know how when you take a crystal prism and pass a beam of sunlight through it, you get a spectrum, which looks like a continuous band of rainbow colors.
你们都知道，拿起一个水晶棱镜，让一束阳光通过它，就会得到一个光谱，看起来就像一条连续的彩虹色带。
Finger Exercises - Bunch all your fingers together and place them through the center of a rubber band.
锻炼手指-把手指聚在一起穿过橡皮筋，展开手指，聚拢手指。
The light passing through a prism is dispersed into a band of colours.
通过棱镜的光线色散成一条彩色的光带。
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