After a while,we found a shady place under some poplar trees.
在一会儿以后,我们在一些白杨树下面发现了一块遮阴的地方。
and so the tools of long ago have remained when even the bones of the men who made them have disappeared without trace.
因此,尽管制造这些工具的人的骨头早已荡然无存,但远古时代的石头工具却保存了下来。