世界 (shì jiè): 世界; 世界; 地球とそこにいるすべての人や物; 特定の領域、範囲、または活動分野

There are many different countries in the world.

I want to travel around the world.

Music is her own world.

People all over the world are paying attention to this issue.

This book takes you into the world of animals.