The Hogen era is a Japanese era name that lasted from 1156 to 1159.

The atomic clock shows a very accurate time.

Understanding the structure of the atomic nucleus is an important part of physics.

Pathogens can pose a significant threat to human health.

This pathogen is a new type of virus.

Nuclear power plants are an important source of energy supply.

When you read this original document, you can understand a completely different meaning from the translated version.

The deadline for the report is next Monday.

The source of this river is at the top of the mountain.

Genzaburo is my best friend.