For a time, it appears, Homo erectus was the only hominid species on Earth.

在一段时期内，直立人似乎是地球上惟一人属。

One of the hallmarks of being a hominid is having opposable thumbs: stronger, longer and more flexible than the thumbless hands of a spider monkey or the non-opposable thumbs of a marmoset.

比蜘蛛猴无拇指或绒猴不对生拇指更强壮、更长、更灵活。

While early hominids likely preferred a heavy brow ridge as a show of dominance and strength, the need for this would have slowly diminished as communication became more useful.

虽然早期原始人可能更喜欢厚脊，以显示统治地位和力量，但随着交流变得更有用，这种需求会慢慢减少。

So after 33 years, the bacteria in these flasks are generation 74,500. If those were human generations, it would represent 1.5 million years of hominid evolution.

33年后， 这些烧瓶中细菌已经产生了74,500代。 如果这些是人类世代，则代表了原始人类 150 万年进化。

There, sitting on this photograph, was a jawbone that I could see was a primitive hominid, but it was just lying there on the floor.

那张照片上有一个下巴骨，我可以看到是一个原始人动物下巴骨，但它就这样放在地上。

These hominids walked across a stretch of moist volcanic ash, which was subsequently turned to mud by rain, and which then set like concrete.

这些类人动物走过潮湿火山灰，经过连绵大雨，火山灰变成了泥浆并点燃。

Olduvai Gorge, an early hominid site in Tanzania, was found by a butterfly hunter who literally fell into its deep valley in 1911.

奥杜威峡谷，一处位于坦桑尼亚史前人类遗址，是在 1911 年被一个确实掉进这条深谷人发现。

But there is also an uncomfortable overlap with the rise of a certain hominid species originating in Africa 150,000 years ago.

另一个双效应就是15万年前某些原于非洲原始人种进化。

The spacecraft gets her name from the Lucy fossil, an ancient human ancestor whose remains transform the study of hominid evolution.

“露西”号得名于“露西”化石，是古人类祖先化石，其遗骸推进了对人类进化研究。

In fact, in 2007, in the Siwa oasis, an early hominid footprint was discovered fossilized in the rocks.

事实上，2007年在锡瓦岩石中，发现了一个早期原始人足迹化石。

One area of paleoanthropological study involves the eating and dietary habits of hominids, erect bipedal primates—including early humans.

古人类学研究一个领域涉及原人（双脚直立行走灵长类动物，包括早期人类）饮食习惯。

About day four, we realized that there was nothing in this chamber but hominids.

大约在第四天时候，我们意识到，这间屋子里除了人动物，什么都没有。

The Asian hominids would have had to appear, as it were, spontaneously.

可以说，除非亚洲人动物是自发出现。

We evolved smooth long foreheads and agile eyebrows compared to a stiff brow ridge of archaic hominids.

与古人类僵硬脊相比，我们进化出了光滑长前额和灵活毛。

If you want to learn more about Lee Berger's life and work, go to achievement. org, and because you are a particularly curious form of hominid, make sure to follow us on Twitter to find out about upcoming episodes.

如果你想了解更多关于李·伯格生活和工作，请去“acievementation.org”网站吧，因为你是一个特别有好奇心人动物类型，请一定要在 Twitter 上关注我们，了解即将播出节目。

Others have suggested that the different testosterone levels in early hominids or our brain's frontal lobe growing larger over time may play a role.

另一些人则认为，早期人类体内含有不同睾丸激素水平，或者我们大脑额叶随着时间推移而变大，可能起到了一定作用。

Two years after Lucy's discovery, at Laetoli in Tanzania Mary Leakey found footprints left by two individuals from-it is thought-the same family of hominids.

在发现露西后两年，在坦桑尼亚莱托里，玛丽·利基发现了被认为是来自同一家族两个人动物一串脚印。

An upright hominid could see better, but could also be seen better.

直立行走人动物看得更清楚，但也被看得更清楚。

Up until that day, there were only something like seven partial early hominid skeletons ever found, and two of those were discovered by Berger's role models and mentors, Don Johanson and Richard Leakey.

在那之前，人们只发现了大约七具部分早期人动物骨骼，其中两具是由伯格榜样和导师唐·约翰森和理查德·李基发现。

I found my first hominid — one-in-ten-million chance — my first day. It was completely — I was hooked.

我发现了我第一个人动物化石——千万分之一机会——我第一天就发现了。我完全被迷住了。