Her smile is very natural, and it feels comfortable.

In philosophy, natural law refers to the moral laws of the universe.

Calculating the natural logarithm is an important part of mathematics.

Natural language processing is the technology that allows computers to understand and generate human language.

I was moved by the beauty of nature.

Chemotransmitters play an important role in the transmission of information between nerve cells.

Neurotransmitters are responsible for transmitting information between nerve cells.

Sufficient caution is necessary when handling radioactive materials.

He is writing a thesis on abiogenesis.

Natural language understanding is an important field of artificial intelligence.