Seigai is my best friend.

Mr. Sotozono is my best friend.

Insects have an exoskeleton, which protects their body.

We are searching for extraterrestrial life.

Please teach me how to calculate the circumcenter of this triangle.

Sotonami is my best friend.

The outward appearance of that building is very modern, attracting people.

He has experience living in a foreign country.

That proposal is completely unthinkable.

He was hesitant to start a new business, but I encouraged him by saying, 'There is a danger of tragedy in any attempt.'