What is the population of the world?

世界人口是多少？

This is a talking map of the world!

这是一个会说话的世界地图！

Possum set out for the other side of the world.

负鼠出发前往世界的另一边。

Maui decides to travel to the edge of the world.

毛伊决定去世界的尽头旅行。

There's a map of the world in our classroom.

我们教室里有一张世界地图。

That's almost one fifth of the world's population.

这几乎是世界人口的五分之一。

About 30% of the world's population is overweight.

世界上大约30%的人口超重。

Many of the world's animals are under threat of extinction.

世界上许多动物正面临灭绝的威胁。

One of the world's most dangerous sports is mountain climbing.

世界上最危险的运动之一是登山。

If 1.75 billion is a quarter of the world's population, what's the whole population of the world?

如果17.5亿是世界人口的四分之一，那么世界总人口是多少？