I doubt many of you in the audience can see the fossil that's in this picture, but if you look very carefully, there is a jaw, a lower jaw, of a 4.1-million-year-old upright-walking ape as it was found at Lake Turkana on the west side.
我怀疑许多观众看不清楚 图片里的化石。 但如果你仔细看，这里有一个颚骨--下颚--， 属于一个四百一十万年前直立行走的猿类， 是在Turkana lake的西边找到的。