知其一不知其二 [－－－－－－－]

Jyutping zi1 kei4 jat1 bat1 zi1 kei4 ji6
Pinyin zhī qí yī bù zhī qí èr

Definitions (Wiktionary)
  1. phrase, idiomatic
    to know or understand only one aspect of a thing and be ignorant of the other; to know or understand something unilaterally or one-sidedly
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）