During the Yuan dynasty, Chinese culture developed greatly.

I have been to Taiyuan.

The population is coming down.

The lifespan of this building is 50 years.

Seigen is my best friend.

He proclaimed that he is the best chef.

He announced his proclamation loudly.

Tengen-sen is a Japanese Go tournament where the highest honor is contested.

He clearly expressed his will and intentions.

The nuclear submarine advances quietly in the deep sea.