He received the letter challenging him to a duel and began preparing for the duel.

Understanding stochastic processes is an important part of statistics.

Gender roles are an important element in defining individual behavior in society.

His role is to fulfill his responsibilities as a leader.

The Markov process is a part of probability theory and is useful for modeling random phenomena.

It is important to understand the importance of health.

Please use the emergency stairs in case of a fire.

Due to the earthquake, the city declared a state of emergency.

He is an expert in computational linguistics and is involved in the development of artificial intelligence.

He has a deep interest in archaeology.