However, some research data show that mandibular incisors' root canal anatomy is comparatively complex, and root canal system has many variations.
但有资料表明下颌切牙的根管解剖形态较为复杂，变异较多。
The root canal systems were comparatively complex, but most of them were most of double three canals.
根管系统虽较为复杂，但主要是双根管和三根管型。
Meanwhile, various visual channels, such as the canal and the slits on the walls, penetrate the complex to allow people to feel life in the park and the city beyond.
与此同时，多条各种各样的视觉通道穿越建筑群，如小河及墙上的豁口， 使人们同时又能感受到外面公园及城市的生活脉搏。
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