Spectroscopy is an important means of investigating the properties of matter.

His true value is his leadership under difficult circumstances.

He is immersed in the research of deep learning.

He is an expert in ethology.

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.