• 1. 双根管: twin-root canal
• 2. 双根油管: coupled tubing

• 1.根管系统虽较为复杂，但主要是双根管和三根管型。
  The root canal systems were comparatively complex, but most of them were most of double three canals.
  dict.yoduao.com
• 2.下颌切牙中，双根管、根管分支和根管分歧都有一定的发生率。
  The two root canals, root canal diverge and root canal branch et al have considerable incidence. Besides, mesial-distal root canal walls of mandibular incisor teeth are thin.
  dict.yoduao.com

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