To possess extraordinary magical power or a vast, hidden capacity, as if holding the entire universe in one's sleeve; often used to describe ingenious methods or illusory feats.
这位民间艺人的手艺真是袖里乾坤，用简单的工具就能变出各种精巧的物件。
This folk artist's craftsmanship truly shows a universe in his sleeve, able to create various exquisite items with simple tools.
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