On the walls of a stone prison that overlooked the scene, a flock of crows alighted.

一群乌鸦落在一座俯瞰着这一切的石头监狱的高墙上。

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Now, scientists report that some relatives of crows called rooks used the same stone-dropping strategy to get at a floating worm.

现在，科学家报道说乌鸦亲戚白嘴鸦能用同样的扔石技巧来够到浮动的蠕虫。

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