He is studying about orpiment, which was used in ancient artworks.

This dynasty lasted for centuries.

The queen is the symbol of the country.

She reigns as the queen of that country.

He is studying the esoteric doctrines of Buddhism.

He is learning the technique of intaglio printing.

He received a proper share of rewards for his work.

I accepted his proposal.

My retort to his sarcasm surprised him.

I retorted immediately to his sarcasm.