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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