I am majoring in physical chemistry at university.

He is a world-famous physicist.

The use of renewable energy helps protect the global environment.

He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

Let's use a radiation dosimeter to measure the radiation levels in this area.

He has a deep interest in archaeology.

The International System of Units is the standard measurement system used by scientists all over the world.

The International System of Units is a standard of measurement widely used around the world.