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本课您将学到：too much, step不只是脚步，un前缀和be （un）aware of sth.句型 提到污染这个话题，你会想到什么？空气污染？（air pollution）水污染？（water pollution）还是噪音污染？（noise pollution）今天我们要来关注的不是这些，而是光污染。（light pollution） As cities grow larger and use more outdoor（户外的） lighting, light pollution（污染） becomes worse（更恶化的）. Using too much light wastes energy and natural resources（资源）. It also makes it more difficult for astronomers（天文学家） to study objects in space that are hard to see. 如果说这些还都是小问题的话，更大的问题就在于人们对光污染的态度： The biggest problem in controlling light pollution is that most people are unaware（没察觉到的） of its effects. To decrease（减少） these effects we can use lights only when needed, direct（将指向） lights down, and put controls on outdoor lighting. Such steps are necessary if we want to save our view of the universe（宇宙）, and the future of astronomy（天文学）. 看来，一味的攀比国外的不夜天并不是明智的选择。凡事都要有个限度，何不让starry-night平静的闪烁呢。 「读书笔记」 随着城市范围的扩大，户外照明越来越多，光污染也越来越严重。（As cities grow larger and use more outdoor lighting, light pollution becomes worse.）注意这句话里cities是主语，位于动词有两个grow和use，用and连接。 | 
