He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

Pathogens can pose a significant threat to human health.

This pathogen is a new type of virus.

He died of disease at a young age.

My father made a new seedbed in the garden.

He is suffering from depression.

He is my sick friend, and we often go to the hospital together.