单词：high rate trickling filter plant
单词：high rate trickling filter plant 相关文章
The US economy is growing a little more than earlier estimates show. But as NPR's Paul Brown told us the rate of growth is still very small. The Commerce Department says the gross domestic product to grow at 1.3% annual rate in the second quarter. It
2011年NPR美国国家公共电台9月
Now Your Turn SAMPLE DIALOG A: Most of the worlds rainforests are in danger of destruction by loggers, farmers and developers. They are disappearing at a rate of 100 acres a minute! B: What a tragedy! , Many of the worlds plant and animal species exi
新视野大学英语：视听说教程 3
Good morning. From the CNN center here in Atlanta. I am Melissa Long. It's Thursday, June. Excuse me, July 2nd, July 2nd. Here is a look at some of the stories happening NOW IN THE NEWS. North Korea has reportedly test-fired 4 short-range missiles o
CNN2009年(七)月
By Cathy Majtenyi Nairobi 19 May 2008 Fuel efficient stoves and ceramic water purifiers are two examples of low-tech innovations that can help people in poor countries improve their quality of life. Because what is known as appropriate technology usu
VOA标准英语2008年（五月）
Ancient Papyrus Reed Could Hold Key to Water Conservation Ancient Egyptians turned papyrus into paper and provided the world with it for thousands of years. Hundreds of thousands of books in the Royal Library in Alexandria and Rome's 58 public librar
VOA标准英语2014年(七月)
More than three years after Hurricane Katrina caused massive damage in New Orleans, the city has less than half its pre-hurricane population and a crime rate higher than any other city in the nation. But, as VOA's Greg Flakus reports, citizens' grou
VOA标准英语2008年(十二月)