This is the 7930th most frequent Chinese word.
首尔
Seoul, the capital city of South Korea.
Here, '首尔' is used as a proper noun referring to the city of Seoul.
首尔是韩国的首都。
Seoul is the capital of South Korea.
In this sentence, '首尔' is used as a destination.
我计划在明年去首尔旅行。
I plan to travel to Seoul next year.
The use of '首尔' here indicates a topic for discussion, specifically referring to the city's food and culture.