trapdoor

n.

（舞台的）地板门，活板门，活盖；

复数：trapdoors

1. The woman shut the trapdoor with a slam.
   这位女主妇砰的一声关上地板门。
2. There's a trapdoor into the attic.
   这儿有一扇通往阁楼的活板门。

Trapdoor
Trapdoor
Hiding Information and Receipts in Trapdoor Knapsacks
Many-to-one trapdoor functions and their relation to public-key cryptosystems
Many-to-One Trapdoor Functions and Their Ralation to Public-Key Cryptosystems.
Hiding information and signatures in trapdoor knapsacks
Hiding information and signatures in trapdoor knapsacks
Sequential Aggregate Signatures from Trapdoor Permutations
Sequential Aggregate Signatures from Trapdoor Permutations.
The trapdoor procedure using autogenous cortical and cancellous bone grafts for osteonecrosis of the femoral head