n. retrogradation
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退积反射是地层厚度向凹陷中心减薄且其顶部被“削截”的一种反射现象，与一般发生在凹陷边缘地层顶界被削截减薄的情形不同。
Retrogradation reflection is a reflected phenomenon that reflects the thinning strata and truncated its top in toward basin center, which is different from that takes place generally in basin margin.
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