Your cooperation is needed for this project.

I need you.

New additional content has been introduced to the game.

He is majoring in soil science at university.

Soil pollution in this area has become serious due to years of industrial activity.

He fell ill due to long-term malnutrition.

In math class, I learned about deficient numbers.

Recently, I've been feeling heavy-headed due to lack of sleep.

This plan is proceeding perfectly without any excess or deficiency.

He thinks that war is a necessary evil.