He is preparing to explore the Dark Continent.

I studied Classical Chinese in university.

He is an expert in fluid mechanics.

His dynamic visual acuity as a baseball player is very excellent.

My opponens pollicis muscle hurts.

He is doing special exercises to strengthen the opponens digiti minimi muscle of his foot.

He underwent surgery due to an injury to the opponens digiti minimi muscle.

He tried to change history by using a time leap to go back to the past.

He tried to change the past by time traveling.

Could you attend the meeting on my behalf?