trepanned

I was not trepanned, I confess, but I betrayed myself.

我承认我不是落到别人的圈套里, 而是我自己陷害了自己.

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The cavity and core were trepanned with frame electrode made of copper wire by EDM.

使用紫铜丝制作线框电极,采用电火花腐蚀方法,以套型的方式加工模具型腔和型芯.

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