This review focuses on various aspects of piercing plug surface oxide film, including formation, compose, property, effect, transformation in the piercing course and the influence of plug's life.

概述了穿孔顶头表面氧化膜的形成、结构、性质、作用，在穿孔过程中的变化及其对顶头使用寿命的影响。

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It is proposed to get the piercing plug sprayed with a plasma coating in a bid to enhance its surface properties, and thus prolong its service life, and cut down the operation costs as well.

提出采用在顶头上喷涂等离子涂层的方法来提高穿孔顶头表面性能，从而提高其使用寿命，降低生产成本。

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The part quality is hard to reach the product locking requirement when forming the end surface thread after piercing.

用一般先冲孔后压型的方法成形端面螺纹工件，质量很难达到产品锁紧要求。

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As the opera progressed, poles and other objects started pushing through and piercing the surface.

NEWYORKER: Man Behind the Curtain

By simply piercing the surface of the water, you set off an energy force within the body of water that extends outward, impacting anything it touches.

FORBES: You Lead By Virtue Of Who You Are

Many of them question whether cultural phenomena, including destruction layers, cultural-piercing features (man-made structures displaced by surface rupturing, e.g. viaducts), structural damage to buildings, indications of repairs, historical accounts and myths can be reliably used as earthquake indicators.

UNESCO: Tales set in Stone: learning from ancient earthquakes