知其然， 不知其所以然

知其然， 不知其所以然 [zhī qí rán bù zhī qí suǒ yǐ rán]

1. ■ 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