休斯博士说，球状闪电似乎是个明显的解释。

Ball lightning seems an obvious explanation, says Dr Hughes.

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球状闪电是一种奇怪的闪电类型。

One strange form of lightning is called ball lightning.

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当微波源被关闭后，天然的球状闪电能持续更多秒。

Natural ball-lightning can last for many seconds.

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这使得球状闪电理论的提出者所面临的一个问题凸显出来。

This highlights a problem faced by people proposing theories of ball lightning .

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这使得球状闪电理论的提出者所面临的一个问题凸显出来。

This highlights a problem faced by people proposing theories of ball lightning .

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