I have been to Outer Mongolia.

I have been to Chicago.

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

He is good at solving trigonometry problems.

This library adopts its own classification method.

He surprised people by using magic.

Understanding patent law is important for protecting new inventions.

Ex post facto laws pose a problem for a fair legal system.

He conducted the trial based on common law.

There is a beautiful bamboo in my garden.