The following are words that can be ignored, hahaha.
The allusion of "a good horse never eats grass again" is that a good horse walks out of the stable and rushes to the vast grassland, where he can catch a glimpse of delicious tender grass at a glance, so he eats it along the selected route until his stomach is big and round, and he will never chew one bite in the east, one bite in the west and then go back to eat the missed tender grass. In other words, not all the grass behind us is bad, nor all the grass in front of us is good. It's just that a good horse will carefully eat the grass in front of him, so there is no' turning back to the grass'. China's idiom means that those who have done something will never look back.