The front wheel does not turn, and the rear wheel turns, that is, the front wheel does not turn and the rear wheel does not turn. This usually appears on bicycles, especially those models that use spoke array hoop and centering wheel to drive spokes, and there is a close relationship between them. It usually happens in cars because of the exhaust and power loss caused by improper assembly of spokes or damage to internal parts, thus preventing the wheels from rotating.
The front wheel does not turn, and the rear wheel turns, which usually indicates that the complex relationship has changed. This change can come from internal or external factors, which makes different parts related before. It can also imply a new perspective to consider the overall situation and make your behavior have different results. In a more popular way, a larger system can be reorganized to form a more effective structure.