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Ancient peneplained surface is dissected by irregular steep sided valleys.
古准平原化地形被不规则的峻峭的山谷所切割.
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The magma falls as volcanic bombs which accumulate around the vent and form steep-sided cones.
熔岩以火山弹的形式落下,并累积在开口周围形成陡峭的圆锥.
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