Metal can bear beating with a hammer, which a stone can't.

金属能经得起锤子的敲打，但石头却不行。

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Metal flow of lead screw cold roll-beating process is analyzed, and metal flow's law of minimum resistance is verified.

分析了丝杠冷滚打过程中金属的流向，验证了金属流动最小阻力定律。

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Cold beating lead screw plays the role of high-speed relative motion in the way of high-speed blowing shaft blanks, so that local plastic deformation forms a non-chip metal forming technique.

丝杠冷打是在工具和丝杠高速相对运动中，以高速断续的方式击打丝杠轴坯，使丝杆轴坯局部塑性变形形成丝杠螺纹的一种无屑塑性成形技术。

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He still occasionally blacksmiths in a little tin shed on the Patagonia campus, and he showed me his latest project, a metal mussel knife that he's been beating into perfect shape sharp at the blade to pry open the shells, blunt at the handle to knock away the barnacles.

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