중국은

In a sentence

• 중국은 큰 나라입니다.

  China is a big country.

  Here, '중국은' is the topic marker phrase for 'China', using '은' to emphasize 'China' as the subject or topic.

• 중국은 내가 처음 방문한 아시아 국가였어요.

  China was the first Asian country I visited.

  In this example, '중국은' highlights 'China' in the sentence as the particular topic being commented on related to the first visitation.

• 중국은 예로부터 풍부한 역사를 자랑합니다.

  China has boasted a rich history since ancient times.

  Here, '중국은' introduces 'China' as the topic, setting up the statement about its history.