reconversion          
noun [ C or U ] (also re-conversion) uk/ˌriː.kənˈvɜː.ʃən/ us/ˌriː.kənˈvɝː.ʒən/
 重新皈依
a process in which someone changes back to a religion or belief they previously followed
  She made a silent deathbed re-conversion to Catholicism.
 re-conversions of Christians back to Hinduism 基督徒重新皈依印度教 
  重新改换用途
the act of changing a building or vehicle from its previous use for a second, third, etc. time
  The council has permitted reconversion back to residential use. 该委员会已允许重新改建为住宅用途。 
 Vessels arrived at the boatyard 24 hours a day, for repairs, refits, and reconversions.
 - More examples
 - His re-conversion to the church was a seven-year process.
 - In 1568 he began training missionary priests for the reconversion of England to Catholicism.
 - The outbuildings can be used for this purpose later on, by means of reconversion.