只知其一，不知其二
zhǐ​zhī​qí​yī​bù​zhī​qí'èr

to know the first, but not the second

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