以下是翻译：
Once a green roof has been in place for a few years,the root systems grow thicken and act like a blanket .
绿色屋顶曾在几年时间内风靡一时.根部系统长厚逐渐变成一张毯子.
Building stay cool in the summer and warmer in the winter .green roofs also absorb a lot of rain water .
建筑能保持冬暖夏凉.绿色屋顶同时也能吸收雨水.
This solves problem builders have had to deal with in other ways.
这从另一个方面解决了建筑师不得不面对的问题.
Green roofs can be more than just energy ,too .Imagine how nice it would be to take the elevator up to the roof and enjoy a picnic in the grass.
绿色屋顶不仅仅只是充满活力.想象一下,坐在电梯去这样一个屋顶在草丛上野餐是多么美好的一件事啊!