科学家发现他们在地球内部穿行上千里，这个发现让地理学家探究地球的内部。

Well, scientists found that they traveled thousands of miles through the earth's interior. This finding enabled geologists to study the inner parts of the earth.

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探究地球上的各种各样的生命物种。给生命明确的定义用以区分生命体和非生命体。

Explore the wide range of living organisms that inhabit the modern Earth. Give life a rigid definition to enable distinction between living and non-living entities.

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利用地震波的信息，研究各向异性介质的物理性质对深入探究地球内部结构有着重要的作用。

It is important to study the physical property of anisotropic media using the information of seismic wave aimed at probing into the earth.

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