他爬上了一颗很大的树，长在一块很高的岩石上，有着茂密的树枝足以隐蔽他，还能够在没有被发现之前看到所有发生的一切。
He climbed up a large tree, planted on a high rock, whose branches were thick enough to conceal him, and yet enabled him to see all that passed without being discovered.
这一方法首次被用于测定陆地岩石的年代，因为之前在地球上还没有发现过这么古老的东西。
This is the first time the technique has been used to date terrestrial rocks, because nothing else this old has ever been discovered on Earth.
这类岩石同动物骨头一起被发现，而且很明显地可以看出这些石头被加工成为可以各种屠宰工具，可以用于在大草原上被猎杀的动物躯体上剥肉、削骨。
They were found next to bones, and it was clear that these stones had been shaped into butchering tools to strip meat and break into the bones of animals killed on the savannah.
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