时空穿梭也会不到最初懵懂
[shí kōng chuān suō yĕ huì bù dào zuì chū mĕng dŏng]
This implies that even time travel ('returning to previous situations') can't bring one back to a naive, innocent past state. It carries a sense of loss or yearning for a simpler, uncorrupted mindset which cannot be regained despite efforts.