My parents are good at cooking.

He came forward and expressed his opinion.

Five ships are anchored in the harbor.

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.

He suffered for a long time due to tabes dorsalis.

Analytical chemistry is a science for clarifying the components and structure of substances.

He is majoring in petrology at university.