多少世纪以来，民俗与常识一直告诉我们，我们依靠内在时钟，但这些时钟什么样子，在那里，怎样起作用，长期以来仍然是一个谜。
Folklore and common sense have been telling us for centuries that we depend on inner clocks, but what and where they are and how they work had long remained a mystery.
已做了足够的实验来证明：信鸽(也许还包括其他的鸟类)似乎身上都存在一个内在的时钟。
Enough experiments have been done to decide that homing pigeons (and maybe other birds) seem to have a build-in clock.
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