He is known as an expert in subcritical nuclear experiments.

He is a renowned person in that field.

In this forest, various organisms live by building a relationship of mutualism.

The destruction of the ozone layer has a significant impact on the Earth's climate.

She had her ovaries checked by a doctor due to a problem.

She is researching about medieval chastity belts.

She is researching about the chastity belts of medieval Europe.

Listening to his story, I indulged in reminiscences of my childhood.

He reminisced about his youth and smiled.

The shape of a hyperbola is very unique and has interesting mathematical properties.