When Stevenson followed the carbon-14 trail back in time, he found carbon-14 levels change with the intensity of solar burning.

当史蒂文森依据碳-14的痕迹追溯过去时，他发现碳-14的含量随着太阳燃烧的强度而变化。

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But the sun is on our backs. With limited time to wander, why trail down to the grotto when we can see it, all mystery preserved, from the ramparts of the basilica?

这时太阳已经在我们的背后，我们的时间有限，既然在教堂的墙上能看到墓室，我们又何必下去呢，倒不如保留一点神秘感吧。

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It took him a long time to find his way back to the logging trail.

他花了很长时间回到伐木路上。

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"There are multiple jurisdictions and unless it's an ongoing crime that uses the same path all the time, the trail goes cold quickly, " Spafford said.

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