单词：low power-factor mercury lamp ballast
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Studies that will be released today show that fish, birds and mammals in New England have significant amounts of mercury in their bodies. The studies find the toxic metal in some unexpected habitats and they suggest that power plants in the Midwest a
2009年NPR美国国家公共电台7月
ballast, ['bləst] n 压舱物（放在船舱或热气球吊篮里的重物，以增加稳定性）；（性格上的）稳定因素 【记】ball球，last最后－最后的球－船最底层放了好多球－压舱物 【类】ballast:instability＝
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US Sets Mercury Pollution Limits from Power Plants 美规定对发电厂进行汞污染限制 The United States government has ordered the country's coal-burning power plants to reduce mercury polluti
VOA2005（上）--环境科学探索
This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Last month the journal Science reported that a Swedish company was planning on using the body heat generated by commuters in a Stockholm train station to
Scientific American(二)月
In that hut, we walked in, 我们走进那间小草屋 and her father and his four wives were sitting there, 她的父亲和四个妻子坐在那里 and her sisters who had just returned because 她的姐妹们也回来了， they had all fled when s
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