This morning, the train was delayed due to a personal injury accident.

He injured his leg in a traffic accident.

He broke the glass carelessly.

His carelessness caused the accident.

He was paying attention to the teacher's talk during the class.

This issue requires attention.

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

This plan is proceeding perfectly without any excess or deficiency.

He fell ill due to long-term malnutrition.

In math class, I learned about deficient numbers.