Protein-degrading enzymes play a role in breaking down unnecessary proteins in the body.

This compound has a tetrahedral molecular geometry.

The Riemann sum is a method for approximately calculating the integral of a function.

The Koizumi Shinjiro structure brought a new wind to Japanese politics.

This problem is difficult.

What does this sentence mean?

Humanities is an academic field that studies human culture and society.

This book is easy to read because the print is large.

He is not an ordinary human.

He participated in the anti-war movement.