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管：竹管；蠡：贝壳做的瓢。从竹管里看天，用瓢测量海水。比喻对事物的观察和了解很狭窄，很片面。
[take a narrow view of sth;look at the sky through a bamboo tube and measure the sea with a calabash——restricted in vision and shallow in understanding] 管中视天,以瓢量海水,喻眼光狭小,见识不广或不自量力 我昨儿晚上的话竟说错了,怪不得老爷说我是“管窥蠡测”!——《红楼梦》三十六回
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