您現(xiàn)在的位置: > Language Tips > Easy English > Odd Question  
     





      What would happen if there were no dust?
    [ 2006-03-23 11:45 ]

    Most of us who have ever cleaned a house would be much happier if there were less dust.

    However, without dust there would be less rainfall and sunsets would be less beautiful.

    Rain is formed when water molecules in the air collect around particles of dust. When the collected water becomes heavy enough the water droplet falls to the earth as rain. Thus water vapor could be much less likely to turn to rain without the dust particles.

    The water vapor and dust particles also serve to reflect the rays of the sun. At sunrise and sunset, when the sun is below the horizon, the dust and water vapor molecules reflect the longer, red, wavelengths of light such that we can see them for more time (starting earlier in the case of sunrise and lasting longer in the case of sunset) than any of the other wavelengths. The more dust particles in the air the more colorful the sunrise or sunset.

     

     
     
     




    一本大道香蕉中文日本不卡高清二区 | 中文字幕精品一区影音先锋| 极品粉嫩嫩模大尺度无码视频| 精品无码av一区二区三区| а√在线中文网新版地址在线| 18禁黄无码高潮喷水乱伦| 久久精品无码一区二区WWW| 天堂а√中文最新版地址在线| 精品久久久久久无码中文野结衣| 亚洲午夜国产精品无码| 美丽姑娘免费观看在线观看中文版| 无码人妻精品一区二区三区在线 | 精品一区二区三区中文字幕| 国产成人无码午夜福利软件| 色综合AV综合无码综合网站| 无码夫の前で人妻を犯す中字| 7777久久亚洲中文字幕| 中文有码vs无码人妻| 亚洲AV无码之日韩精品| 无码人妻一区二区三区在线水卜樱| 少妇无码一区二区三区| 午夜不卡无码中文字幕影院| 亚洲中文字幕视频国产| 日韩中文字幕在线不卡| 中文字幕久久亚洲一区| 免费无码H肉动漫在线观看麻豆| 中文无码不卡的岛国片| 亚洲欧美精品一区久久中文字幕 | 成人午夜福利免费无码视频| 亚洲精品无码AV中文字幕电影网站| 精品久久久久久无码中文字幕一区 | 暖暖免费日本在线中文| 刺激无码在线观看精品视频| 日韩免费无码一区二区三区| 日韩av无码一区二区三区| 久久无码人妻一区二区三区| 日韩精品人妻系列无码专区 | 国产精品午夜无码AV天美传媒| 精品无码av一区二区三区| 国产激情无码一区二区app| 国产免费黄色无码视频|