一项加利福尼亚州的研究发现，该州用移动电话拨打的紧急呼叫电话中，多达45%的是无谓轻率或者恶作剧。

A California study found that as many as 45 percent of the emergency calls placed from cell phones in the state were frivolous or prank calls.

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当然我们不能完全排除有人恶作剧的可能性，但至少确实有些石头在移动。

And although one can't entirely rule out the possibility of some prank being played, at least some of the rocks appear to be moving under natural circumstances.

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