burs造句

He picked off the burs that had stuck to his overcoat.
他摘下粘在外衣上的刺果.

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.

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