[----------]

Jyutping zi1 kei4 jin4 ji4 bat1 zi1 kei4 so2 ji5 jin4
Pinyin zhī qí rán ér bù zhī qí suǒ yǐ rán

Definitions (Wiktionary)
  1. phrase, idiomatic
    to know the result without knowing the reason for the result

知其然而不知其所以然 [----------]

Jyutping
Pinyin zhī qí rán ér bù zhī qí suǒ yǐ rán

Definitions (CC-CEDICT)
  1. to know that it is so but not why it is so (idiom)