Xia was the first dynasty of China.

During the era of the Cold War, the world was divided into two major powers.

During the era of the Cold War, the world was divided into two major powers.

This is my first question.

This algorithm was developed for optimization.

We need to optimize this process.

It is difficult to find the optimal solution to this problem.

The Spanish Civil War was a conflict that lasted from 1936 to 1939.

She can speak Spanish fluently.

I want to go to the Spanish State.