为此，他收集了一系列他的受试者已经凭经验有所了解的物体。它们有移动的趋势，但在长期的进化进程中所不可能接触到的物体：汽车。

For that, he included a class of object that his subjects would have learned, by experience, have a tendency to move, but which past evolution could have had no purchase on: motorised vehicles.

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他的研究结论是，当岩石嵌入到一大片于夜晚在沙子表面形成的冰中时，它们就可能会移动。

His study concluded that the rocks may be moved when they become embedded in sheets of ice forming at night on the surface of the sand.

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伯纳德先生称他相信开发商最终可能会从每一千苹果iAD移动广告商或者15到30美元的收入。

Mr. Barnard said he believes developers could eventually earn between $15 and $30 for every thousand iAds.

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