只知其一，不知其二

zhi3 zhi1 qi2 yi1 , bu4 zhi1 qi2 er4

to know the first, but not know the second (idiom); only partial information

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只知其一，不知其二|只知其一，不知其二 [zhǐ zhī qí yī , bù zhī qí èr] ► to know the first, but not know the second (idiom); only partial information