Prior to 560m years ago, animal fossils are rare.

6亿年以前的动物化石寥寥无几。

Many animals that lived thousands of years ago are now extinct.

许多生活数千年前的动物现已绝种。

Cities few had heard of 20 years ago are now vast metropolises.

20年前鲜为人知的城市现在都成了大都市。

The men who were born one thousand years ago are very lucky.

一千年前出生的人是多么幸运啊。

The calves born just a few weeks ago are now strong.

几周前才出生的小鹿现在变得强壮起来。

Feral hogs, introduced by Spanish explorers centuries ago, are everywhere in Florida.

几个世纪前由西班牙探险家引进的野猪在佛罗里达州随处可见。

And a lot of games from 35 years ago are basically unplayable now.

35年前的许多游戏现在基本上都不能玩了。

For Bragiel, any concerns he had about Singapore almost 10 years ago are long forgotten.

对于布拉吉尔来说，十年前对于新加坡的担忧早已抛诸脑后。

Even the men who were born one hundred years ago are much luckier than me.

就算早出生一百年的人也比我幸运。

Over a fifth of the world's freshwater fish species of a century ago are now endangered or extinct.

目前，一个世纪之前世界上的淡水鱼类中超过五分之一濒临灭绝或已经灭绝。

Keza Macdonald said that some games from 35 years ago are unplayable – so, not possible to play them.

科扎·麦克唐纳德说35年前的一些游戏没法玩了——所以，不能玩了。

In Canada three men who escaped from a Quebec prison by helicopter two weeks ago are back behind bars.

两周前用直升飞机从加拿大魁北克越狱的三名男子目前已被抓获。

The people you were 10 years ago are not the people you are today.

10 年前的你不是今天的你。

So dinosaurs that went extinct 65 million years ago are ineligible for this experiment.

所以6500万年前灭绝的恐龙没有资格做这个实验。

Israeli police say human remains found in a pair of suitcases a week ago are those of two young children.

以色列警方称，一周前在一对行李箱中发现的人类遗骸是两名幼童的遗骸。

Remarkably, some qanats built by the Persians 2,700 years ago are still in use today.

值得注意的是，波斯人在 2700 年前建造的一些坎儿井至今仍在使用。

The oldest H. sapiens fossils, which date to 230,000 years ago, are from sites in Ethiopia.

最古老的智人化石可追溯到 23 万年前，产自埃塞俄比亚。

Homo erectus fossils from 1.8 million years ago are known from a place in the Caucasus Mountains in Georgia called Dmanisi.

180万年前的直立人化石是在格鲁吉亚高加索山脉一个叫德马尼西的地方发现的。

Observations made over 2,000 years ago are often as applicable to us now as they were to the Romans.

2,000 多年前的观察结果现在常常适用于我们，就像它们适用于罗马人一样。

Artificial intelligence techniques, which we discussed a few episodes ago, are perhaps the most promising avenue to overcome these challenges.

我们在几集之前讨论过的人工智能技术可能是克服这些挑战的最有希望的途径。