undov.解开；松开；取消undoped flow system无掺杂气流系统undocumented feature未加产明功能部件undoing enhancements作废增加功能undoing cover or hedge解除抛补或避险undoped single crystal非掺杂单晶体Undoes a merging of two撤消两个Undo-Proof Operations防撤销操作Undo enables exploration撤销支持用户探索Undo and Redo support.撤销和重做支持。Undo this hurt you cause把你以前对我的伤害抹掉