He is an expert in ethology, and his research is highly regarded worldwide.

He is an expert in sociolinguistics.

I am very interested in sociolinguistics.

He stated his opinion outspokenly as '咢'.

He is majoring in psychology.

Gaku is my best friend.

He learned the old character form of 學 to study ancient documents.

I like listening to music every day.

I like watching movies at the Rakugai Theater.

He stared at the jade, moved by the beauty of the two pieces of jade joined together.