Hirotsugu is my best friend.

He is writing a paper about the event horizon.

Yesterday, a large landslide occurred in the nearby mountain.

This car can run at 100 kilometers per hour.

He is an expert in seismology.

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

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

Using the private railway makes commuting very convenient.

We respect Japanese culture.

We are going on a trip tomorrow.