51. The best evidence for the layered-mantle thesis is the well-established fact that volcanic rocks found on oceanic islands,islands believed to result from mantle plumes arising from the lower mantle,are composed of material fundamentally different from that of the mid-ocean ridge system, whose source,most geologists contend,is the upper mantle. (5 -)
对于地幔分层论点来说,最好的证据乃这样一个确认的事实,即在那些海洋岛屿 这些岛屿据信是源于由下层地幔升上来的地幔柱状溶岩流(mantle plume) 上发现的火山岩石,是由与海洋中部山脊系统的物质根本不同的物质构成的,而这一海洋中部山脊系统的成因,大多数地质学家论辩道,为上部地幔。
难句类型:复杂修饰、插入语
解释:本句前面的主干并不算难,即the evidence is the fact that,难就难在fact之后说明fact 的同位语从句。此从句中既有大段插入语,又有从句,较为难读。同位语从句的主语是volcanic rocks,主语后面的found on oceanic islands是分词修饰volcanic rocks的;islands后面又有一个说明islands的同位语islands believed to result from mantle plumes arising from the lower mantle,此同位语实际起到一个分隔主谓的同位语的作用。其后是谓语动词are composed/of fundamentally different from that of the midocean ridge system, whose source, most geologists contend, is the upper mantle。
句中有一些专有词汇。如果抛开文章不说,单看这一个句子,则句首的layered mantle thesis就难以理解。但是如果读者能够读懂句子的大致意思,看到layered mantle thesisr最有力证据就是其材料fundamentally different from the upper mantle,这应该可以推测出,既然不同于上层地幔,则这个理论一定是在说地幔有不同的层面。
意群训练:The best evidence for the layered-mantle thesis is the well-established fact that volcanic rocks found on oceanic islands,islands believed to result from mantle plumes arising from the lower mantle,are composed of material fundamentally different from that of the mid-ocean ridge system, whose source,most geologists contend,is the upper mantle.
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