His actions are said to be deeply sinful.

My younger brother is a schoolchild.

He likes to take a walk in the park at dusk.

He is spending a lot of time on experimental research.

His father is a very strict person.

During the Yuan dynasty, Chinese culture developed greatly.

This is my original.

Understanding the original principle is important for solving problems.

The budget for this project has been reduced by 20%.

What is the source of this information?