He is spending a lot of time on experimental research.

This lake is known as a dangerous body of water.

Global warming is a big issue that affects all of us.

He is an expert in geophysics.

He believes in the geocentric theory.

A terrestrial planet may have an environment similar to Earth.

This typhoon caused great damage.

I use a clamp to fix this timber.

Mr. Kasugai is my best friend.

The sturgeon is a type of freshwater fish, and due to its size and deliciousness, it is considered a high-end fish.