He underwent surgery for a herniated intervertebral disc.

He asserted his droit de suite as an artist.

He avoided participating in the Twitter feminist debate.

The government decided to crack down on illegal activities.

He is working as a member of the International Criminal Police Organization.

Special judicial police officers are working hard every day to protect the law in Japan.

I learned how to calculate definite integrals in math class.

The calculation of the antiderivative is a fundamental part of calculus.

This ring is made of lazurite.

This volcanic rock contains a lot of olivine.