... head end passage；油缸头部(油)通道 head end pin；油缸头部销 head end port；油缸头部孔 ...
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He has perfected a technique of etching letters onto microscopic surfaces-including the tip of a screw, the head of a pin and the pointed end of a paperclip.
他已练就了在微观物体表面雕刻字母的绝佳技艺，包括雕刻螺丝钉的尖端、饰针的顶部和曲别针的尖端。
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