I have been to Mongolia.

Learning the Erzya language is difficult.

This algorithm significantly improves the speed of data processing.

He had two children with his second wife.

She was devastated by sadness and wailed.

She wailed in overwhelming sorrow.

The era of the Five Good Emperors is considered the golden age of the Roman Empire.

This comprehensive project combines many different elements.

He generalized the information and made a new plan.

She was devastated by sadness and wailed.