He prefers natural foods.

Calculating the natural logarithm is an important part of mathematics.

His car spontaneously combusted all of a sudden.

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 always proactively suggests new ideas.

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.