He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

He has a deep interest in archaeology.

He is spending a lot of time on experimental research.

Amorphous substances have characteristics different from crystals.

One part is important.

The Austronesian languages are one of the most widely distributed language families in the world.

The Austroasiatic languages, including Vietnamese and Khmer, are a language family that includes many languages.

The Austronesian language family is one of the most widely distributed language families in the world.