... edge of Mach cone ==> 马赫锥母线 edge of punch ==> 冲头缘 edge of regression ==> 回归边缘,脊线 ...
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该冲头包括端部，该端部适于刺穿入口孔并折弯环绕该入口孔的材料，以沿着该入口孔的内缘形成残留的废料。
The punch includes an end portion adapted to Pierce an entry hole and bend material around the entry hole to form a retained slug along an inner edge of the entry hole.
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