It's taken thousands of years to reach this size.它花了几千年才长到这么大

thousands of数千的 ...

It travels thousands of miles per second.

它一秒钟能走几千英里。

Men have been making music for thousands of years.

人类创作音乐已有数千年历史。

may have seen the sun rise more than 1.5 million times.而且可能历经了一百五十多万次的日出日落

more than超过；多于；不仅仅；非常

This city has a population of more than 1,000,000.

这个城市人口超过一百万。

I'll stay here not more than three days.

我将待在这里最多不超过三天。

Like animals, plants are constantly competing for food.植物和动物一样，无时无刻不在抢夺食物

compete for(为 ... )争夺； 竞争

Thirty people had to compete for only ten openings.

三十个人必须只为十个名额来竞争。

The two teams compete for the championship.

那两队都要争当冠军。

Striving to produce offspring努力繁衍后代

strive to争取, 追求

I am striving to explain explicitly.

我力争做出详尽的说明。

They are striving to complete the task given them.

他们正努力完成交给他们的任务。