Something that is completely out of season or context, rendering it useless or inappropriate; an anachronism.
在当今信息时代，固守老旧的传达方式，无疑是冬扇夏炉，毫无效率可言
In today's information age, stubbornly adhering to outdated communication methods is undoubtedly like a winter fan and summer stove, utterly inefficient.
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