I just watched a video about world population yesterday.

我昨天刚看了一个关于世界人口的视频。

The world population is expected to reach 9 billion by 2050.

世界人口预计到2050年将达到90亿。

The world population is doubling every 35 years.

世界人口每隔35年翻一番.

What will world population be by 2050 AD/AD 2050?

公元2050年世界人口将达到多少？

World population is forecast to peak at 9.2bn by 2050.

预计世界人口到2050年将达到92亿的峰值。

Well, the current world population is around 7 billion.

当今世界人口大约为70亿。

The world population is doubling every thirty-five years.

世界人口正以每三十五年增加一倍的速度增长。

Youth make the most significant part of the world population.

年轻人是世界人口的最重要组成部分。

Nowadays the world population has reached more than 7000 million.

如今，世界人口已经达到7000多万美元。

World population is forecast to peak at 9. 2bn by 2050.

预计世界人口到2050年将达到92亿的峰值。