World
世界
When we say the world, we mean the planet Earth.
当我们说世界一词时,其实指的是行星地球。
The world is more than 4.5 billion years old, so it has a long history.
地球已超过45亿岁了,所以它有着漫长的历史。
It is a place for people to live.
地球是人们定居的地方。
It is a place for animals and plants to live.
地球是动植物生存的地方。
Do you know how many people live in the world?
你知道世界上有多少人吗?
The number of people in the world is 6.7 billion.
世界上的人口数量是67亿。