He values his private life.

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.

Even though he is a doctor, he doesn't take care of his own health. It's truly a case of 'physician, heal thyself'.

He is researching the effects of underground nuclear tests.

My house is near the station.

It is reported that North Korea has conducted another underground nuclear test.

Groundwater pollution has become a serious environmental problem.