prisoner swap, 換俘

Ukrainian pilot Nadiya Savchenko released by Russia in prisoner swap | World news | The Guardian
http://www.theguardian.com/world/2016/may/25/ukrainian-pilot-nadiya-savchenko-released-by-russia-in-prisoner-swap-deal

Prisoner exchange - Wikipedia, the free encyclopedia

A prisoner exchange or prisoner swap

prisoner swap - 海词

囚犯交換