nurs []

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He picked off the burs that had stuck to his overcoat. 他摘下粘在外衣上的刺果. 来自《简明英汉词典》
Methods: The root canalroot canal orifice burs and helical drilling bits were prepared in advance. 方法: 采用根管口台阶状车针与螺旋型根管钻组合起来扩大根管. 来自互联网

nurs []

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