知其一，不知其二
zhī​qí​yī​bù​zhī​qí'èr

to know only one aspect

  1. 知 zhī verb
    to know
    to know; to be aware of; to realize or sense
  2. 其一 qí​yī
    the first; one of them
    The first of several points or options; firstly; one of the items mentioned
  3. ， bù
    non-Chinese
  4. 不知 bù​zhī verb
    not to know
    to not know; to be unaware of or have no idea about
  5. 其二 qí'èr
    secondly
    second; used to introduce a second point in a list