51. Unlike most of the worlds volcanoes, they are not always found at the boundaries of the great drifting plates that make up the earths surface; on the contrary, many of them lie deep in the interior of a plate.
跟世界上的大多数火山不同的是,它们并不总是在由构成地球 表面巨大漂流板块之间的边界上出现;相反,它们中有许多位于一个板 块较纵深的内部。
52. The relative motion of the plates carrying these continents has been constructed in detail, but the motion of the plates with respect to another cannot readily be translated into motion with respect to the earths interior.
携带这些大陆板块的相对运动已经能够被详细地表述出来,但是这些板 块相对于另一些板块的运动还不能轻易地解释为它们相对于地球内部 的运动。
53. As the dome grows, it develops seed fissures ; in at least a few cases the continentmay break entirely along some of these fissures, so that the hot spot initiates the formation of a new ocean.
暂缺
54. While warnings are often appropriate and necessary--the dangers of drug interactions, for example--and many are required by state or federal regulations, it isnt clear that they actually protect the manufacturers and sellers from liability if a customer is injured.
尽管警告常常是适当而且必须的--比如对于药物相互作用的危险提出 警告--许多警告还是按州或联邦政府规定要求给出的,然而 并不清楚,如果顾客受到伤害时,这些警告是不是确实可以使得生产者 和销售者豁免责任。
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