感谢楼主总结，小的顺便问个句子
To map Earth’s interior, geologists use a network of seismometers to chart seismic waves that originate in the earth’s crust and ricochet around its interior, traveling most rapidly through cold, dense regions and more slowly through hotter rocks.
这里的traveling的逻辑主语是什么, 我想的是seismic waves 但是这个不是主句主语，还是说，traveling修饰的是前面整个句子要表达的意思？
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发表于 2015-8-22 14:01:56
