鹦鹉螺架构的20米长的主体结构是构建在周围石堤墙的基础上的，但又没有完全碰触。
The 20 meter long primary structure of Nautilus is constructed over and around the stone embankment wall, but does not touch it.
熔岩流的边界比中心冷却得更快，形成了被称为流堤(图片中心位置)的似墙的结构。
The sides of the flow can also cool faster than the center, leading to the formation of wall-like structures known as flow levees (image center).
边缘的熔岩要比中间的冷却的快，这样就形成了像墙一样的结构，我们称之为流堤。
The sides of the flow can also cool faster than the center, leading to the formation of wall-like structures known as flow levees.
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