包括以后你采铁矿出的坚固的石头，也可以做这些。
Including after you have taken out of solid iron stone, you can also do these.
人们知道他们使用的是木制滑轮，这种滑轮可以被制造得足够坚固来承受大块石头的重量。
And they are known to have used wooden pulleys, which could have been made strong enough to bear the weight of massive blocks of stone.
就像罗马城的伟大是由各个小的部分组合起来的一样，金字塔也如构建它的石头一样坚固。
Just as the greatness of the city of Rome is due to the combination of its smaller parts, a pyramid is only as strong as the stones it is comprised of.
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