以管窥天 to peep at the sky through a bamboo pipe
Explanation
比喻眼光狭窄，见识有限，看问题片面。
It means to have a narrow viewpoint and see only part of the situation.
Origin Story
春秋时期，齐国名医扁鹊途经虢国，听说虢太子暴毙，前去探望。他询问了太子的症状，判断太子只是假死，可以救活。但虢国的中庶子并不相信，扁鹊便说他是“以管窥天”，见识短浅。中庶子不服，扁鹊就在太子身上施针，太子果然苏醒过来，经过调理，二十天后便痊愈了。这个故事说明，看待问题要全面，不能以偏概全，否则会犯严重的错误。
During the Spring and Autumn period, Bian Que, a famous physician from Qi, passed through the state of Guo and heard that the Crown Prince had suddenly died. He went to visit and, after inquiring about the symptoms, judged that the prince was only apparently dead and could be revived. But the senior official of Guo did not believe him, so Bian Que said that he was "looking at the sky through a bamboo pipe," lacking insight. The official was unconvinced, so Bian Que used acupuncture on the Crown Prince, who indeed revived. After treatment, he recovered fully in twenty days. This story shows that it's important to consider problems comprehensively and not to jump to conclusions, or serious mistakes might happen.
Usage
形容眼光狭窄，见识短浅，看问题片面。
Describes someone who has a narrow viewpoint, limited experience, and sees problems only one-sidedly.
Examples
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他总是以管窥天，缺乏全局观。
ta zongshi yi guan kui tian, quefan quanju guan
He always sees things in a narrow way, lacking a global perspective.
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不要以管窥天，要多听听别人的意见。
buya yi guan kui tian, yao duotingting bie ren de yijian
Don't be short-sighted; listen to others' opinions more often!