In the normal case — up at the top, those two deaths occur simultaneously.

在通常的情况下，这两者的死亡是同时发生的。

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A major accident can only occur if all these systems fail simultaneously.

只有在所有这些系统同时失效时才可能发生事故。

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A major accident can only occur if all these systems fail simultaneously.

只有在所有这些系统同时失效时才可能发生事故。

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