Title: What excavator is fast? Comparative analysis of popular topics and performance across the entire networkRecently, popular topics in the field of engineering machinery have revolved around "excavator speed", especially in short video platforms and industry forums, users' attention to efficient

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Why are pebbles roundIn nature, pebbles are eye-catching with their smooth and round appearance. Whether it is riverbeds, beaches, or valleys, these stones always seem to be polished to a round and unbroken by some force. So, why are pebbles round? What scientific principles are hidden behind this p