这是一个全球性的记录：在取自不同大陆位置的沉积标本中，同位素比率的变化非常小。
It is a global record: there is remarkably little variation in isotope ratios in sedimentary specimens taken from different continental locations.
其他人则担心18年后在家门口出现一位素曾谋面的小孩。
Others have worried about having an unknown child appear at their doorstep 18 years later.
下一次，如果能够从整个房间中认出一位老朋友，可要感谢催产素哟！
The next time you spot an old friend from across the room, thank oxytocin.
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