Something that is worldwide exists or happens throughout the world.
Today, doctors are fearing a worldwide epidemic.
如今,医生们担心会爆发世界性的流行病。
If something exists or happens worldwide, it exists or happens throughout the world.
all over the world , around the world
His books have sold more than 20 million copies worldwide.
他的书在全世界卖出了两千多万本。
Worldwide, an enormous amount of research effort goes into military technology.
在全世界,大量研究精力都被投放到军事技术上。