单词：secretory immunoglobulin A
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From NPR news in Washington, I am Jeanie Herbst. Defense Secretory Ash Carter is on his way to the middle east to try to persuade US allies there to put more resources into the fight against Islamic State. NPR's Scott Horsley reports the mission come
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Hello, I am Carl Azuz, welcome you to a new day and a new month, CNN Students, we are gonna take flight with some California teenagers on the beat, but we are beginning today with an anniversary. Tonight, I come forward to the American people and to
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From NPR News in Washington, I'm Korva Coleman. Afghanistan President Hamid Karzai is claiming the United States is working with the Taliban in an effort to keep U.S. troops in Afghanistan. He says the U.S. and militants are scaring Afghans into beli
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The body's internal clock helps to regulate a water-storing hormone so that nightly dehydration or trips to the toilet are not the norm, research suggests. In an article published in Nature Neuroscience today, neurophysiologists Eric Trudel and Charl
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