Sufficient caution is necessary when handling radioactive materials.

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.

This design has a unique charm because it is asymmetrical.