The reason of the formation of gas porosities and cracks on the head face of valve tappet has been studied.

本文分析了气门挺杆端面气孔、裂纹形成原因。

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Methods: in this group, we applied the skin soft tissue expansion to repair the tissue defect of head face neck.

方法：采用国产硅橡胶扩张器行皮肤扩张术，修复耳鼻和头面颈部软组织缺损。

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The sealing trough and the sealing ring arranged on the head face of the upper mouth of the cup body have good sealing effect.

在杯体上口端面上所设置的密封槽、密封圈，具有很好的密封效果。

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For years, researchers blamed muscle tension from tightening in the face, neck and the skin on top of the head.

VOA: special.2010.03.30

And the head you are seeing at the back there he was trying to touch is his wife's face.

他用手于去触摸的那个人,是他的妻子。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Here we have two of our T.A.'s, actually these are the two head T.A.'s, and I want you to face forward so you don't see what I'm doing.

我们的两个助教在这里,事实上是两个助教主管,把脸朝前,不要看到我的动作

耶鲁公开课 - 博弈论课程节选

Mr Reid, who has undergone three operations for head and face injuries, was discharged from Derriford Hospital in Plymouth.

BBC: Hospital discharges polar bear attack leader Spike Reid

The quake turned everyone's head to face the same way and the Haitian people have picked up and moved on.

BBC: Haiti three years on: Your stories

Mr Chaplin had 25-27% burns predominantly on his head, face and hands, had his finger tips amputated and was permanently scarred.

BBC: Leicester arsonist set fire to men in pub garden