手术后，病人的视力出现了倒退，回到了以前的状况。

After surgery, the patient experienced a ___recurrence of their previous vision condition.

根据协议，这栋房产将在20年后自动归还给原业主的后代。

The agreement specifies the ___reversion of the property to the original owner's descendants after 20 years.

研究人员注意到某些植物在几代人工培育后出现了返祖现象。

Researchers noticed a ___reversion to wild traits in some plants after several generations of cultivation.