When one visits the Grand Canyon, they are literally looking into the past, and seeing the layers of rock from past eras.
当游客来游览大峡谷时，他们实际上是在回顾历史，观察过去时代形成的各种岩层。
When one visits the Grand Canyon, they are literally looking into the past, and seeing the layers of rock from past eras.
当游客来游览大峡谷时，他们实际上是在回顾历史，观察过去时代形成的各种岩层。
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