The most popular view is that Egyptian workers slid the blocks along smooth paths.Many scientists suspect workers first would have put the blocks on sleds(滑板).Then they would have dragged them along paths.To make the work easier,

　　fat from cattle.Bonn has now tested this idea by building small sleds and dragging heavy objects over sand.

　　Evidence from the sand supports this idea.Researchers found small amounts of fat, as well as a large amount of stone and the remains of paths.

　　However, physicist Joseph West thinks there might have been a simpler way, who led the new study .West said, 揑 was inspired w hile watching a television program showing how sleds might have helped with pyramid construction.I thought, ‘Why don't they just try rolling the things？’ ” A square could be turned into a rough sort of wheel by attaching wooden poles to its sides,

　　So he tried it.

　　He and his students tied some poles to each of four sides of a 30－kilogram stone block.That action turned the block into somewhat a wheel.Then they placed the block on the ground.

　　ound they could easily roll the block along different kinds of paths.They calculated that rolling the block required about as much force as moving it along a slippery(滑的)path.

　　West hasn't tested his idea on larger blocks，but he thinks rolling has clear advantages over sliding.At least，workers wouldn't have needed to carry cattle fat or water to smooth the paths.

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