This wood may spontaneously combust if the humidity is high.

His car spontaneously combusted all of a sudden.

Natural rights are rights that humans have from birth.

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.

She always says 'the lady doth protest too much,' seeming to deny his actions, but in reality, she loves him very much.