以偏概全 Generalize from a part to the whole
Explanation
以偏概全，指以局部、片面现象来推断整体的情况，缺乏全面性和客观性。
To generalize from a part to the whole, referring to the deduction of the overall situation from partial or one-sided phenomena, lacking comprehensiveness and objectivity.
Origin Story
从前，在一个偏僻的小山村里，住着一位老农。他家门前有一棵古老的银杏树，树龄已有千年之久。每年秋天，银杏树的叶子都会变成金黄色，美不胜收。老农每天都精心照料着这棵银杏树，但他只关注树叶的美丽，而忽略了树干的健康。有一年冬天，一场大雪过后，银杏树的树干被大雪压断了，老农这才意识到自己以往的维护方法存在问题，只顾及树叶的美丽而忽略了树干的坚韧，犯了以偏概全的错误。
Once upon a time, in a remote mountain village, there lived an old farmer. In front of his house stood an ancient ginkgo tree, a thousand years old. Every autumn, the leaves of the tree turned golden yellow, a sight to behold. The farmer carefully tended to this ginkgo tree every day, but he only focused on the beauty of the leaves, neglecting the health of the trunk. One winter, after a heavy snowfall, the trunk of the ginkgo tree was broken by the weight of the snow. Only then did the farmer realize that his previous maintenance methods were problematic, focusing only on the beauty of the leaves while ignoring the toughness of the trunk, making the mistake of generalizing from a part to the whole.
Usage
多用于批评别人看问题片面、不全面。
It is often used to criticize others for looking at problems one-sidedly and not comprehensively.
Examples
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他根据个别现象就对整个情况作出结论，这是以偏概全。
tā gēnjù gèbié xiànxiàng jiù duì zhěnggè qíngkuàng zuò chū jiélùn, zhè shì yǐ piān gài quán.
He drew a conclusion about the whole situation based on individual phenomena; this is a generalization.
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不能以偏概全，要全面考虑问题。
bù néng yǐ piān gài quán, yào quánmiàn kǎolǜ wèntí.
Don't generalize hastily, consider the problem comprehensively..