单词：Hydropiminocyline
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Motor-Free Device Reduces Stress from Walking 新型可穿戴附加设备有效减轻腿部肌肉的负荷 Devices that help people walk were once thought to be difficult, if not impossible, to design. Until recently, such a device required electrici
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Scientists Develop Motor-free Device That Eases Walking Strain 科学家发明无动力助行走设备 Devices that help people walk were once thought to be impossible to design without some kind of auxiliary power. But U.S. scientists at Carnegie Me
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科学家发明无动力助行走设备 Devices that help people walk were once thought to be impossible to design without some kind of auxiliary power. But U.S. scientists at Carnegie Mellon University and the University of North Carolina have built
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MARY LOUISE KELLY, HOST: Black students and students with disabilities are disproportionately disciplined in America's public schools. That is the conclusion of a sweeping new review by an important government watchdog. And NPR's Cory Turner has more
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JEFFREY BROWN:And, finally tonight, we turn to Poland, where there's a familiar controversy surrounding new energy exploration. Our story is part of a collaboration with the Pulitzer Center on Crisis Reporting, and comes from special correspondent St
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