为已知的未知事件做准备相当困难,除非你重视他们。
It's extremely hard to prepare for the known unknowns until you take them seriously.
超过15,000人的平民在此前的未知事件中丧生。
More than 15, 000 civilians died in previously unknown incidents.
超过15,000人的平民在此前的未知事件中丧生。
More than 15,000 civilians died in previously unknown incidents.
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