Hundreds of millions of predatory mammals by the year 2050.

共计数亿只哺乳动物捕食者。

It said that by the year 2030...

书上说到了2030年。

By the year 2030, there'll be computers...

到了2030年，有些电脑。

By the year 2000, there were 15 member countries.

到2000年，发展到15个成员国。

'Cause by the year I turned nine, I lost count.

因为在我九岁的时候，就已经数不清了。

Three feet of sea level rise by the year 2100.

到2100年，海平面将上升三英尺。

And it came into use in English by the year 1800.

这个表达是在1800年开始用于英语中的。

" How many can we sell by the year 2000? " they asked.

他们问，“我们到2000年能买到多少台？”

By the year 2050, the growth rate should be even less.

到2050年，增长率应该更低。

And by the year 214 China looked a little bit like this.

到了214年，中国的势力地图看起来像这样。

This action plan aims to reach its goals by the year 2010.

这个行动计划旨在到2010年实现其目标。

Scientists hope to get this mission off the ground by the year 2025.

科学家希望能在2025年前启动这项任务。

And by the year 2050, the extent of global food demand will increase 70%.

到2050年，全球粮食需求量将增加70%。

Instead, the agreement provides eight pathways to achieve net zero by the year 2050.

相反，该协议提供了到2050年实现净零排放的八种途径。

And by the year 2020, the percentage of service workers will increase to 90%.

到2020，从事服务业的人数比例将上升到90%。

Scientist Carl Fagen is talking about putting a man on Mars by the year 2010.

科学家卡尔·费根正在谈论2010年把人类送上火星的计划。

The word since followed by the year 1973 gives you a clue about the meaning.

" since" 和" 1973年" 可以让你对这句话的意思有所了解。

Some people believe that humans could live on the planet Mars by the year 2100.

有些人相信到2100年人类可以在火星上生活。

As a result, beavers had all but disappeared from the area by the year 1900.

因此，海狸在1900年时几乎消失殆尽。

Worldwide demand for lithium is estimated to increase by six times by the year 2030.

据估计，到2030年，全球对锂的需求将增加6倍。