我把插入语放在()内 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 midocean ridge system, whose source, (most geologists contend), is the upper mantle. 所以就变成 volcanic rocks found on oceanic island are composed of material different from the midocean ridge system. 就是说明volcanic rocks from the lower mantle, midocean ridge system from the upper mantle为layered-mantle thesis的证据 我的理解是这样 ※ 引述《pig2362235 (pig2362235)》之铭言： : 标题: [问题] 36套 EXCERISE 11 : 时间: Wed May 13 10:45:38 2015 : : : 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 midocean ridge system, : whose source, most geologists contend, is the upper : mantle. : : 这句话真的好长 而且好多插入语 完全拆不出来 所以看不懂 : 麻烦各位高手帮忙解惑 谢谢 : : -- :

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