根车
根车-
一个男人斜靠着一根柱子等车——这并没有什么非同寻常的——那趟车驶往曼哈顿上城方向，然后向东驶向皇后区。
A man leaned against a pillar , the way anyone might , waiting for the train that would go uptown in Manhattan and later turn east for Queens .
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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。
Methods : The root canal with root canal orifice burs and helical drilling bits were prepared in advance .
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目的：介绍一种由螺旋型根管钻、行设计的根管口台阶状车针、成桩核组成的预成桩核系统。
Objective : To introduce a new prefabricated post-and-core system , a helical drilling bit and a prefabricated post-and-core consisting of a root canal orifice bur which was designed by the author .