Lesson 141 Global Warming

 　　Have you noticed that it's getting warmerand warmer every year? To put it simplythat's because of air pollution. Scientists tellus that because of air pollution, the earth'sheat cannot escape. This is known¹ as globalwarming. If this situation is allowed tocontinue, it will just keep getting hotter anhotter. Then, can you imagine what willhappen? We should all, therefore, do ourpart to stop polluting the air and help savethe world.  

全球气温上升 
   　　你有没有注意到天气一年比一年变得还要暖和了呢?简言之，那是因为空气污染的缘故。科学家告诉我们由于空气污染，地球的热气无法散出去。这就是为人所知的全球变暖。如果我们任由这种情形一直持续下去，地球就会变得越来越热。那么，你能想像会发生什么事吗?因此，我们全都应该尽一己之力来防止污染空气并拯救地球。

1 known   

adj.大家知道的；知名的，已知的

参考例句：

• He is a known artist.他是一个知名的艺术家。
• He is known both as a painter and as a statesman.他是知名的画家及政治家。