In pressure vessels, C and D seam which are located at the joint of flange, tube-shape object, jointed tube, and head of pressure vessels separately are the most complex seams.

压力容器设备中法兰与筒体、法兰与接管连接处的C类焊缝和封头端部、筒体上马鞍形的D类焊缝是最为不规则的且施焊工艺最为复杂的焊缝。

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The average head weighs 7 to 8 pounds—a lot of pressure to be putting on your face every night.

头部平均重量是7-8磅——趴着的话对脸部可是不小的压力。

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Christine Williamson, head of the pressure group Silicon Support UK, said artificial implants had ruined the health of many women.

BBC: Breasts

Dmytro Sherembey, the HIV-positive head of the patients' pressure group which helped organise Liza's appeal in parliament, the Ukrainian Community Advisory Board, predicts licences will be issued to those who pay bribes.

BBC: Ukraine's youngest HIV campaigner

The head of the bank has been under pressure to revive the struggling bank and increase capital by increasing earnings, selling off non-core business units and cutting costs.

FORBES: Bank Of America CEO Gets A Raise, Moynihan's $12.1M Beats Jamie Dimon's Pay