外锥体是指等壁厚的空心圆台，其内表面与内锥体部件外表面组成摩擦副的零件。
外喷的气体将大量的灰尘和火山灰带入空中。数以吨计的火山灰，在地球的这个洞的周围，形成一个锥体。
The out-rushing gases carry up into the air huge amounts of dust and ashes. The tons of ashes form a cone around the hole in the earth.
方法：细胞外记录离体海马脑片CA1区锥体细胞层群体峰电位。
METHODS: Extracellular population spikes of the pyramidal cell layer in the hippocampal CA1 region were recorded in vitro.
目的：介绍改良外鼻锥体侧翻术在颅底肿瘤手术的临床应用及手术技术。
Objiective: to introduction the clinical application and surgical technique of the modified rhinotomy for treatment of tumor involving skull base.
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