求翻译：湖垣顶部高出水面30-50 m，呈封闭的环状，周围皆为森林，湖垣内边缘很陡，垣墙主要由玄武质熔岩和碎屑岩组成，以火山碎屑岩为主，含有大量围岩岩屑，底部为基底混合岩，在水面之上的湖壁陡崖上可见到火山岩。是什么意思？

Lake Yuan at the top above the water surface 30-50 m, was closed ring around all forests, very steep inner edge of the Lake Yuan Yuan Qiang mainly composed of basaltic lava and clastic rocks, pyroclastic rocks, containing a large number of surrounding rock debris at the bottom of the basement migmat

Sadakazu Tanigaki Lake top high out of the water 30 - 50 m, is closed around the ring, and is wall in Lake Forest, steep edges, wall is primarily by quality basalt lava rocks and debris, with volcanic rock debris, with a large number of rock debris, and the bottom base for mixed rock, on the surface

The lake wall crown outdoes water surface 30-50 m, assumes the seal ring-like, periphery all is the forest, in the lake wall the edge is very steep, the wall mainly is composed by the Xuanwu nature lava and the clastic rock, take the pyroclastic rocks primarily, includes the massive adjacent formati

Ruins high out of the water at the top of the Lake 30-50 m, closed loop around all forests, within the ruins of the lake edge of steep, wall composed mainly of basaltic lava and clastic rocks, dominated by pyroclastic rock, contains a lot of rock cuttings, base mix rock at the bottom, above the surf

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