To know what something is but not why it is so; to know the phenomenon but not its essence or underlying cause; to know the 'how' but not the 'why'.
许多人都能熟练操作智能手机，但对于其内部运作原理，大多都是知其然而不知其所以然。
Many people can skillfully operate a smartphone, but most only know how to use it without understanding its internal operating principles.
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