Some backtracking is probably inevitable.有时改变决定可能是不可避免的。Leonard jumped in his car and started backtracking.伦纳德跳进车里，开始原路折返。The backtracking mechanism is an important facility for programming in logic.回溯机制是逻辑程序设计的重要设施....
Leonard jumped in his car and started backtracking.伦纳德跳进车里，开始原路折返。Some backtracking is probably inevitable.有时改变决定可能是不可避免的。The backtracking mechanism is an important facility for programming in logic.回溯机制是逻辑程序设计的重要设施.Leon...