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方墩和条形砧子,一个听起来很有质感,一个看上去像滑板。它们既没有精美的外形,也没有精密的内部结构。但它们却充当了打磨齿轮和取螺钉时的重要角色。
A square pier and a strip of anvil, a sounded texture, one that looks like a skateboard. They have neither exquisite appearance nor sophisticated internal structure. But they serve as an important part of grinding gears and taking screws.