毫无所知

• know nothing about
• knew nothing about
• known nothing about
• not the ghost of

例句

1. 关于他们的具体旅程，我毫无所知。
   For the details of their itinerary, I am all to seek.
2. 他对他所造成的麻烦毫无所知，无忧无虑。
   He was blithely unaware of the trouble he had caused.
3. 想不到经理对生产竟然毫无所知！
   To think that the manager knew nothing about the production!