Scientists would like to place a huge mirror in space above the earth．It might be sixty miles wide．It would be used to catch the rays of the sun．It would direct the sun's rays upon the earth as a child might do to make sunlight dance on the wall with a hand mirror．
科学家们想在地球上方的太空中放置一面巨大的镜子，它可能有60英里宽，用来捕捉光线。它会把太阳光照射到地球上，就像孩子用镜子在墙上跳阳光舞一样。
Why do they want to do this？The sun's rays could be helpful in many ways．They could light up cities by night．The warm rays could stop frosts which might come at might and fruit crops．They could melt dangerous icebergs in the ocean．Perhaps they could change cloud movements and bring rain where it is needed．
他们为什么要这样做？太阳光在很多方面都有用。它们可以在夜晚照亮城市，温暖的光线可以阻止可能会出现的霜冻和水果作物。它们可以融化海洋中危险的冰山。也许它们可以改变云的走向，在需要的地方带来雨水。
