adj.impossible to achieve
同义词：unachievableunattainableunrealizable
Doing the undoable: Magpie Trial long-term follow-up.
Making the Undoable DoableMilgram, the Holocaust, and Modern Government
Undo for Operators: Building an Undoable E-mail Store
Can We Help Dropouts: Thinking about the Undoable.
Incremental Graph Computations: Doable and Undoable
Whole-Faculty Study Groups: Doing the Seemingly Undoable.
Impossibility: Thoughts about the unknowable, the undoable and the unthinkable
Method and apparatus for a programming language having fully undoable, timed reactive instructions
"Put Some Bass in Your Walk": Notes on Queerness, Hip Hop, and the Spectacle of the Undoable
DOCUMENT PROCESSING AND MANAGEMENT APPROACH TO EDITING A DOCUMENT IN A MARK UP LANGUAGE ENVIRONMENT USING UNDOABLE COMMANDS
