Why the early Olorgesailie people went to such trouble we can only guess, of course.

当然，远古的奥洛戛萨里人为什么要找这样的麻烦，我们当然不得而知。

Olorgesailie was, in short, a kind of factory; one that stayed in business for a million years.

一句话，从某种意义上说，奥洛戛萨里是一个工厂，一个在100万年时间里没有停业过的工厂。

Despite over sixty years of searching, no human bone has ever been found in or around the vicinity of Olorgesailie.

尽管已进行了60余年的挖掘，奥洛戛萨里及其周围地区从未发现过人类化石。

The researchers found evidence of obsidian being transported to the Olorgesailie Basin, up to 88 kilometers away from where the rock was found.

研究人员发现了黑曜石被运往奥洛戈赛利叶盆地的证据，盆地距岩石出土地约88公里。

The Olorgesailie people disappeared from the scene about 200,000 years ago when the lake dried up and the Rift Valley started to become the hot and challenging place it is today.

奥洛戛萨里人大约在20万年前消失，当时湖泊已经干涸，大裂谷地区开始变得像今天这样炎热和艰苦。