一物不知 Know nothing about a thing
Explanation
指对某一事物有所不知。比喻知识尚有欠缺。
It refers to the lack of knowledge about a certain thing. It is a metaphor for the lack of knowledge.
Origin Story
年轻的书生李白，勤奋好学，博览群书。一日，他来到一位老学究家拜访，老学究见他年轻气盛，便想考考他。老学究指着书房里满满的书架说：“小伙子，这些书你都读过吗？”李白谦虚地答道：“不敢说都读过，但对于大部分书籍，我都略知一二。不过，这浩瀚的学海，我仍然一物不知的地方很多，还需要继续努力学习。”老学究听后，赞许地点点头，夸奖李白谦虚好学，并鼓励他继续努力，不断提升自己。
Li Bai, a young scholar, was diligent and studious, and read widely. One day, he visited an old scholar. The old scholar, seeing his youthful arrogance, wanted to test him. The old scholar pointed to the full bookshelves in his study and said, "Young man, have you read all these books?" Li Bai humbly replied, "I dare not say that I have read them all, but I have a general understanding of most of them. However, in this vast ocean of knowledge, there are still many things I don't know, and I need to continue studying hard." The old scholar nodded approvingly, praising Li Bai for his humility and studiousness, and encouraging him to continue his efforts and constantly improve himself.
Usage
通常用作谓语、定语，形容知识的不足。
It is usually used as a predicate or attribute to describe the lack of knowledge.
Examples
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他虽然学识渊博，但在某些方面仍然一物不知。
tā suīrán xuéshí yuānbó, dàn zài mǒuxiē fāngmiàn réngrán yī wù bù zhī
Although he is very knowledgeable, he still knows nothing about certain aspects.
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对于这个新技术，我还一物不知，需要尽快学习。
duìyú zhège xīn jìshù, wǒ hái yī wù bù zhī, xūyào jǐnkuài xuéxí
I still don't know anything about this new technology, and I need to learn it as soon as possible.