管窺蠡測

- （比喻眼光狹窄，見識短淺） benighted; have a very narrow mental outlook; be limited in vision and understanding; view [look at] the sky through a tube or measure the sea with a calabash -- restricted in vision and shallow in understanding; take a narrow view of things; look ... through a tube; see things through a tube and measure sea water with half a shell; with little learning, incapable of reaching any intellectual heights or depths of thought