也许是因为他太努力工作了，所以他前额的头都凸了。

Maybe he works too hard, so the hair of his front head is bared.

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此文介绍了连续挤压内凸筋口琴管模具的设计方法及其模具芯头的冷挤压加工。

This paper is about die tongue making: the design method and cold-press formation.

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该螺丝包括一螺头、一凸台及一螺杆。

Wherein the screw comprises a screw head, a lug boss and a screw rod.

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该螺丝包括一螺头、一凸台及一螺杆。

Wherein the screw comprises a screw head, a lug boss and a screw rod.

youdao