逐步后退法；弯曲根管；根管预备；根管充填。
Step-back technique; Curving root canal; root canal preparation; root canal condensation.
不锈钢K锉组（SS）采用常规手用不锈钢K锉、逐步后退法预备根管。
The third group were prepared using the stainless steel hand K-files with the step-down technique(SS group).
法提克的妈妈向后退了几步，端详了下那陌生人—此时她的怒容竟转变为满脸的惊喜。
But when his mother stepped back and looked at the stranger, her anger was changed to surprise.
如果这样都不能使对方后退一点，那就别无他法了。
法希从尸体旁向后退了退身，再次高举起黑光灯，使光线从更大的角度散发出来。
Fache backed away from the body and raised the black light again, letting the beam spread out in a wider Angle.
本文主要讨论秘书问题的变形——“组面试问题”在目标是选择最优或次优时的最佳选择策略（停止规则），采用的主要方法是后退归纳法和边界阶段方法。
This article deals with a natural variation of the classical secretary problem called the group interview problem, in which each group contains several alternatives and each group of alternatives .
但是有危险任一方法，和新惨败的危险进入在已开发世界的后退之内不能够被摒弃。
But there are risks either way, and the danger of a new lurch into recession in the developed world cannot be dismissed.
叙述了走向长壁后退式柔性掩护支架采煤法在急斜煤层中的应用及效果。
The paper discusses the application and the effects of the coal mining method with retreating-longwall flexible shield support in steeply-inclined coal seam.
叙述了走向长壁后退式柔性掩护支架采煤法在急斜煤层中的应用及效果。
The paper discusses the application and the effects of the coal mining method with retreating-longwall flexible shield support in steeply-inclined coal seam.
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