I have been to Chicago.

The Paleogene period was a very important time in the history of the Earth.

He is an expert in paleography, and he is good at deciphering ancient handwritten documents.

This paper machine produces high-quality paper.

This rayon thread is very durable and long-lasting.

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

We should always remember the power of Kannon in difficult times.

This photo has a shallow depth of field, so the background is blurry.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.