What is the appropriate distance from the teeth to the tip of an endotracheal tube? From the nares to the tip for a nasal intubation.

牙齿到气管导管头端的核实距离为多少？鼻插管时鼻孔到导管尖端的距离有多少？

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The distance from bottom of stop, between the eyes, to the tip of nose should be as short as possible and not exceed the length from the tip of nose to the edge of underlip.

从止部底端(两眼中间)到鼻尖的距离尽可能短，不超过从鼻尖到下唇边缘的距离。

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