They called for a boycott in opposition to the inappropriate actions of the company.

They called for a boycott of the product.

Everest is the highest peak in the world.

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

Do you understand the necessity of this project?

Our school has introduced a new PA system.

The filesystem of my computer has broken down.

He is an expert in systems engineering.