The thunder roared, and the sky was filled with flashes of lightning.

雷声咆哮着，天空布满了闪电。

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Much bigger flashes are usually seen during thunder-storms.

雷雨天时，通常会看到强得多的闪电。

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Much bigger flashes are usually seen during thunder-storms.

雷雨天时，通常会看到强得多的闪电。

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