热点和它们的火山痕迹是标志板块移动的里程碑。
The hot spots and their volcanic trails are milestones that mark the passage of the plates.
在山麓小丘之下，我瞥见了一两个坟头，坟头已经裂开，样子与火山口相仿——也许，它是部落首领的埋葬之地，或者就是某个迷失的游牧开拓者的一座里程碑。
Once or twice under the foothills I glimpsed the mound of a kurgan, broken open like the lips of a volcano – the burial-place of a tribal chief, perhaps, or the milestone of some lost nomad advance.
在山麓小丘之下，我瞥见了一两个坟头，坟头已经裂开，样子与火山口相仿——也许，它是部落首领的埋葬之地，或者就是某个迷失的游牧开拓者的一座里程碑。
Once or twice under the foothills I glimpsed the mound of a kurgan broken open like the lips of a volcano? The burial-place of a tribal chief perhaps or the milestone of some lost nomad advance.
凝灰岩锥形成时，岩浆从火山内陆到达大海，溅射层层叠叠的玄武岩火山灰，最终上升到这个纪念碑的自然状态。
Tuff cones are formed when magma from an inland volcano reaches the sea, sputtering layer upon layer of basalt ash that eventually rises into this monument of nature.
凝灰岩锥形成时，岩浆从火山内陆到达大海，溅射层层叠叠的玄武岩火山灰，最终上升到这个纪念碑的自然状态。
Tuff cones are formed when magma from an inland volcano reaches the sea, sputtering layer upon layer of basalt ash that eventually rises into this monument of nature.
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