Many that remain are poorly preserved because the probability of destructive deformation or metamorphism increases with age.
由于变形或变质作用随时间增加概率大大增加，许多现存的遗迹状况欠佳。
Many that remain are poorly preserved because the probability of destructive deformation or metamorphism increases with age.
由于变形或变质作用随时间增加概率大大增加，许多现存的遗迹状况欠佳。
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