She decided to undergo facial reconstructive surgery.

He is dedicated to the study of organogenesis.

His body showed a rejection reaction to the transplanted organ.

His single word triggered a chain reaction, and everything changed.

She overreacted to his words.

Nuclear reactions are used for mass production of energy.

I was surprised by his overreaction.

This weir was built to regulate the water level of the river.

He picked up the small torch and illuminated the darkness.

This river has a beautiful pebbled riverbed.