This wood may spontaneously combust if the humidity is high.

Natural rights are rights that humans have from birth.

We must strive to protect the natural environment.

He is an expert in folklore studies, and his research is highly regarded worldwide.

He likes to take a walk in the park at dusk.

The Calopteryx cornelia is a species endemic to Japan, and it has beautiful wings.

Natural language understanding is an important field of artificial intelligence.

We are planning to visit the nature reserve this weekend.

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

He is writing a thesis on abiogenesis.