I am majoring in econometrics at university.

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

This problem is difficult.

What does this sentence mean?

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

This compound has a tetrahedral molecular geometry.

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

He is playing the character of Bun.

He is patient like a ninja.

Zoonosis is a disease that spreads from animals to humans, or vice versa.