know that sth. is so but not why is so ; knowing it's so, but don't know why it's so ; He knows the thing for a fact but does not know the ways and wherefores of it. ; know the hows but not the whys
我们知道这些偶发事件是在天空拥有的最大的灾难；但我们仅仅——大概了解——只知其然，却不知其所以然。
We know that these events are among the most cataclysmic that the sky holds; but we understand only-and approximately-the how, not the why.
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