Pandora's box
noun [ S ] uk/pænˌdɔː.rəz ˈbɒks/ us/pænˌdɔːr.əz ˈbɑːks/
潘多拉魔盒（指邪恶之源）
something that creates a lot of new problems that you did not expect
Sadly, his reforms opened up a Pandora's box of domestic problems. 可悲的是，他的改革开启了潘多拉魔盒，引发了一系列的国内问题。