关于手机的英语作文：the color of snow

2020年11月29日发(作者：方校书)
DICTATION
[00:50.77]The Color of Snow
[00:53.88]Generally, the color of snow appears white.
[00:57.87]This is because the light we see from the sun is white.
[01:02.17]Most natural materials take in some sunlight.
[01:06.09]This gives them their color.
[01:08.45]However, when light travels from air to snow,
[01:12.31]some light is sent back, or reflected.
[01:15.81]Snow crystals have many surfaces to reflect sunlight.
[01:20.30]Yet the snow does take in a little sunlight.
[01:23.99]It is this light that gives snow its white appearance.
[01:28.34]Sometimes, snow may appear to be blue.
[01:32.32]The blue light is the product of
[01:34.19]a long travel path through the snow.
[01:37.49]In simple terms, think of snow as a filter.
[01:41.42]A filter is designed to reject some substances,
[01:45.03]while permitting others to pass through.
[01:48.22]In the case of snow, all the light makes it through
[01:51.76]if the snow is only a centimeter thick.
[01:54.75]If it is a meter or more thick, however,
[01:57.69]blue light often can be seen.