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Rainbow
彩虹
A rainbow is a circle of colors that appears in the sky when sunlight shines on raindrops.
彩虹是陽光照射到空氣中的水滴里，發生光的色散和折射而形成的一種自然現象，雨后常見。
The sunlight and water work together to form rainbows.
陽光和水汽相互作用形成彩虹，
Think of sunlight flowing out in many lines, called rays.
想象下陽光散發出被稱為光束的很多射線。
The rays are an equal distance from each other.
光束相互之間距離相等。
The light energy of the rays acts similar to waves, which have different lengths.
光束的能量的類似于有不同的長度的海浪。
Sunlight is made up of several wave lengths.
彩虹是由各種間距不等的色光組合而成的。
People see the mix of lengths as what is called white light.
人們看到的色光組合混合被稱為白光。
But things change when a ray of white light hits a raindrop.
但是當一縷太陽光射入水滴時就會發生改變。
That is when the colors that make up white light slow to different speeds.
這是因為組成太陽光的各種色光會慢于不同的速度，
The light bends as it enters the raindrop.
然后在水滴里以不同的角度連續折射，
This bending separates the white light into colors,each color weakening as it moves into the next color.
這一折射將白光分成各種顏色,每種顏色在移動到下一個顏色時都會變弱。
The light rays turn or bend again when they come out of the raindrop.
光線從雨滴射出時會再次發生折射現象。
This continuous bending through an area of raindrops is what makes the rainbow a perfect circle.
于是這種不斷的折射就形成了絢麗的彩虹。
