In this chemical reaction, hydration plays an important role.

This area is rich in subterranean rivers, which serve as a source of groundwater.

Natural language processing is a technology that allows computers to understand and analyze human language.

He is writing a thesis on abiogenesis.

Natural language understanding is an important field of artificial intelligence.

We are planning to visit the nature reserve this weekend.

He is an expert in physical anthropology, conducting research on human evolution.

His words seemed to add fuel to the fire in an already tense situation.

Rumors are spreading that he is the culprit, but there must be some reason because 'where there's smoke, there's fire.'

He is pinching pennies to the extent of lighting a fire on his nails for saving money.