When passengers on the train look out of the window, the trees on both sides of the railway quickly retreat. What is the reference for passengers to choose

When passengers on the train look out of the window, the trees on both sides of the railway quickly retreat. What is the reference for passengers to choose

train

When people sit in a running train, the train moves forward with () as the reference, and the trees on the roadside move backward with () as the reference

Road or ground; person or vehicle

As shown in the picture, Xiao Ming is sitting on the running train, and the trees are moving backward like a lightning stroke. Taking the trees as the reference, Xiao Ming is a good friend______ Yes, because Xiaoming is relative to trees______ ．

Xiao Ming is sitting on the moving train. The position between Xiao Ming and the trees has changed. Taking the trees as the reference, Xiao Ming is moving