心中无数 have no idea
Explanation
指对情况了解不清楚，心里没底。
means that one is unclear about a situation and has no clear picture.
Origin Story
老张是一位经验丰富的木匠，他接了一个制作大型木制家具的订单。图纸复杂，要求精细，这让老张心中无数。他翻来覆去地研究图纸，测量木材，但仍然感到迷茫。他知道，如果不能在规定的时间内完成高质量的家具，将会面临巨大的经济损失和信誉危机。他开始寻求帮助，向经验丰富的同行请教，查阅大量的书籍和资料，反复推敲每一个细节，一步步地理清思路。经过几天的努力，老张终于心中有数，制定了详细的制作计划，并按计划有条不紊地进行。最终，他如期完成了订单，并获得了客户的高度赞扬。这次经历让老张明白，遇到难题时，不能盲目行动，而要积极寻求帮助，认真分析，才能做到心中有数，最终克服困难。
Old Zhang, an experienced carpenter, received a large order for custom-made wooden furniture. The blueprints were complex and required precision, leaving Old Zhang feeling uncertain. He studied the blueprints, measured the wood, yet still felt lost. He knew that failing to deliver high-quality furniture within the given timeframe would lead to significant financial losses and reputational damage. He started seeking help, consulting experienced colleagues, reviewing numerous books and materials, and meticulously examining every detail, step by step clarifying his thoughts. After days of diligent efforts, Old Zhang finally felt confident, formulating a detailed production plan and proceeding in an orderly manner. Ultimately, he completed the order on time and received high praise from the client. This experience taught Old Zhang that when encountering challenges, one shouldn't act blindly but actively seek help, carefully analyze the situation, so as to have a clear picture and finally overcome difficulties.
Usage
通常用于描述对某种情况不了解，心里没有底的状态。
Used to describe a state of uncertainty and lack of clarity regarding a situation.
Examples
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对于明天的考试，我心中无数，心里一点底也没有。
duiyü mingtian de kaoshi, wo xinzong wushu, xinli yidian di ye meiyou.
I have no idea what will happen tomorrow.
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面对突如其来的问题，他心中无数，不知如何是好。
mianduitu ruchulai de wenti, ta xinzong wushu, buzhi ruhe shi hao
Faced with the unexpected problem, he was at a loss, without a plan.