科学家们说，很久以前的建筑工人也许是在石头上绑上木杆，然后在沙子上滚动。
Long-ago builders could have attached wooden poles to the stones and rolled then across the sand, the scientists say.
王志军还听到了其它响声，他当时猜测是石头滚动时撞击的声音。
Wang also heard other noises, perhaps stones crashing against stones.
王志军还听到了其它响声，他当时猜测是石头滚动时撞击的声音。
Wang also heard other noises, perhaps stones crashing against stones.
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