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在执行sudo dnf install python3-opencv -y 时出现以下问题，是超时了吗？怎么解决
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'dnf clean packages'.
Error: Error downloading packages:
Curl error (28): Timeout was reached for https://mirrors.fedoraproject.or ... 28&arch=aarch64 [Resolving timed out after 30000 milliseconds]
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