管窥 guǎnkuī
[look at sth. through a bamboo tube—have a restricted view] 从管中窥物,喻目光短浅,见闻不广
区区管窥,岂能照一隅哉!——《后汉书·章帝纪》
管窥止寸耳
见识狭小。《后汉书.卷三.肃宗孝章帝纪》:「朕在弱冠,未知稼穑之艰难,区区管窥,岂能照一隅哉!」也作「管闚」。
英语 to look at sth through a bamboo tube, to have a restricted view