想学说英语吗？我们的学习美国英语日常对话在这里提供一个很好的练习机会。请点击以下声频链接，收听美国人的对话，并参照英文原文和相关中文解释。今天的对话是谈酸雨对环境的影响。
Yana: I just don’t understand. We used to fish here all the time as kids, and we always caught a lot of fish. We’ve been here three hours and haven’t caught a single fish.
Brandy: Two words: acid rain. The water in the lake is probably acidic from acid rain, and many types of fish are not able to survive in acidic water. Before long, acid rain may wipe out most of the fish in this lake.
Yana: So the acid rain is decreasing the biodiversity within the lake’s ecosystem.
Brandy: Yes. As the lake becomes more acidic, the numbers and types of fish, plants and animals that live in the lake decrease.
Yana: And there’s nothing we can do about it?
Brandy: Well, to reduce acid rain, we can clean up the oil and coal power plants that cause it or use more renewable resources, such as solar power and wind power.
词语解释（程度较高的读者也可以选择听对话词语的英文解释）
Acid rain：酸雨，即含有危险化学物质——燃烧矿物燃料产生的含硫烟尘——的降雨，伤害树木、庄稼、建筑物、以及湖泊溪流中的鱼类
To wipe out ：全部消灭
Biodiversity ：生物多样化
An ecosystem：一种生态系统，即存在于某一自然环境中的全部生命体（如动植物）和非生命体（如石头、土壤、阳光、水）
Reduce：减少，在谈环境时常指减少使用某种东西或资源。
A renewable resource：再生资源，即取之不尽或者可以自然再生的资源，如太阳能和风能
Solar power ：太阳能，即来自阳光的能量
Wind power：风能 ，即通过空气流动产生的能量
American English 网站提供可供英语学生和教师免费使用的多种英语资源。American English Facebook网页提供每天更新的英语学习资料。
“日常对话”由国务院教育与文化事务局英语语言项目处（Office of English Language Programs, Bureau of Educational and Cultural Affairs）资深项目官员海蒂·豪兰（Heidi Howland）编写。
