He quickly calculated the answer to the problem.

He is known as an excellent military staff.

Coral reefs are very important for marine ecosystems.

I fully agree with his opinion.

I fully approve of his opinion.

We need to evaluate the profitability of this project.

Grandpa takes a walk in the park every day.

To convert dollars into yen, use the current exchange rate.

This product is suitable for mass production.

We will start mass producing this new product from next month.