Old Church Slavonic is the first language written by the Slavs.

He is an expert in computational linguistics and is involved in the development of artificial intelligence.

He is interested in geometrical shapes.

He is conducting research on historical kana usage.

He often thinks about problems from a humanitarian perspective.

His company is facing the risk of a hostile takeover.

He is spending a lot of time on experimental research.

That plan is too impractical, it's difficult to implement.

His plan was so unrealistic that no one could believe it.

This painting depicts a surreal landscape.