海斯表示，很多在线图片多少有些地理标签，不过这些描述可能经常有错误或者太过于宽泛，例如一张美国大峡谷的照片被标记为美国。
Hays said many online photos have some sort of geographic label, but these human descriptions can often be incorrect, or overly broad, such as a photo of the Grand Canyon labeled "U.S."
汤普森说科学家们在火星上发现了一个峡谷，与这个峡谷相比，“美国大峡谷就显得很渺小了”。这个峡谷现在仍然可能有水。
Thompson said scientists had found a canyon on Mars "that makes the Grand Canyon look like a small canyon, " where water could still be present.
行星上深的山谷类似地球的美国大峡谷，被认为是由水冲蚀形成的。
The planet has deep valleys similar to Earth's own Grand Canyon, which are thought to have been carved by rushing water.
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