trackless

adj.

无足迹的，无路的，不在轨道上行驶的；

1. New roads fingered once trackless plains.
   新公路手指般伸展于曾经是人迹未到的平原。
2. These carts must be capable of traveling over stretches of trackless desert.
   这些车必须能在没有任何足迹的连绵沙漠上运行。
3. He struke off into trackless wilderness.
   他踏上了无路的荒野。
4. He who pours contempt on nobles made them wander in a trackless waste.
   他使君王蒙羞被辱，使他们在荒废无路之地漂流。

Trackless online algorithms for the server problem
Trackless surgery using focused ultrasound: Technique and case report
GUIDANCE SYSTEM FOR SELF-PROPELLED TRACKLESS CARRIAGES
Trackless surgery using focussed ultrasound: technique and case report. Min Inv Ther 1:13-19
RADIAL POSITION REGISTRATION FOR A TRACKLESS OPTICAL DISC SURFACE
Trackless lesions in nervous tissues produced by high intensity focused ultrasound (high-frequency mechanical waves).
A simple method for production of trackless focal lesions with focused ultrasound: physical factors
On identifying the most time-saving walking route in a trackless mountainous terrain
Application of Trackless Rubber-tyred Subsidiary Haulage for Conveyance Job of Comprehensive Mechanized Coal Mining Face in Undergro...
A simple method for production of trackless focal lesions with focused ultrasound: statistical evaluation of the effects of irradiat...