单词:iron manganese concretion
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Words and Their Stories: Military Expressions 词汇典故:军事词汇 This is Phil Murray with WORDS AND THEIR STORIES, a program in Special English on the Voice of America. We tell about some common expressions in American English. 这里是美国
By Naomi Schwarz Northern Mauritania 17 October 2007 In arid Mauritania, where Sahara desert meets Sahel grasslands, a train stretching up to two and one half kilometers snakes along the northern border. Built to carry iron ore from mines in the nort
This is Scientific American's 60-Second Science, I am Cynthia Graber. This'll just take a minute. It might look and even feel like paper, but a new material created by scientists at MIT is designed to be an oil spill super-absorber. This technology d
This is Scientific American -60 seconds science. Im Cynthia Graber. This will just take a minute. A coal mine can degrade its local environment. But fungus may inadvertently help clean up the mine with its own waste products. Researchers worked with
This is scientific Americans 60 second science,I'm Cynthia Graber.This will just take a minute.A coal mine can decrease the local environment but a Fungi may indivertantly help cleanup the mine with its own waste products. Researchers worked with the
Here are 7 health problems from eating too many almonds! 以下是吃太多杏仁会导致的7种健康问题! 1.Kidney Stones 肾结石 Certain diets and foods can make people more prone to kidney stones, especially diets high in oxalates. This is