In the fabrication of petrochemical plant (pressure vessel), the keys to quality control of bumped head are the diameter calculation of head blanking and its forming.

在石油化工设备压力容器制造中，对于整体冲压成形封头的质量控制关键是封头展开下料毛坯直径展开计算和冲压成形环节。

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She bumped her head against a low branch.

她的头撞到一根低矮的树枝上。

《柯林斯英汉双解大词典》

The room was dark and I bumped (my head) against [on] the door.

屋子里很黑，我(的头)碰到了门上。

《新英汉大辞典》

Interestingly, Samsung last week bumped up the head of its mobile division, J.

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