Over the decade the world's population grew from just over 6.1 billion to about 6.9 billion.
在这十年，世界人口从刚过六十一亿增加到约六十九亿。
The angle actually goes from minus pi over two to pi over two.
实际上，角度取值范围是从-π/2到π
(trip over) the cables are all bright yellow to prevent pedestrians from tripping over them.
电缆全部是明亮的黄色，以防行人绊脚。
In a city they will have a chance to meet people from all over the country and all over the world.
在城市里他们有机会见到来自全国和全世界的人。
You can go from one book to another. And you can read your favorite book over and over again.
你大可以从一本换到另一本，喜爱的书，不妨一读再读；
You can go from one book to another. And you can read your favorite book over and over again.
你大可以从一本换到另一本，喜爱的书，不妨一读再读；
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