Jade must be cut to make a tool.

Jade can't be useful if it hasn't been polished. If a person doesn't study, he won't know his responsibility to his neighbors.

analyse

If jade is not polished, it can't be useful.

Without carving, beauty is not jade.

If a person doesn't study, he won't know his responsibility to his neighbors.

If you don't study hard, you won't understand (serving the people and saving the country).

The landlord came completely according to your request. If you feel satisfied, please support me a lot!