A baby's fontanelle closes a few months after birth.

This book explains in detail how to use the 'Kyūjitai form of 声門' in old Japanese.

His incisors are very sharp.

There is a large sluice gate in this river.

I am very interested in natural science.

Natural numbers start from 0 and continue as 1, 2, 3, 4, 5, 6, 7, 8, 9.

Natural selection plays an important role in the evolution of organisms.

I was moved by the beauty of nature.

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.