The pressure vessel is the third barrier to radioactive material release.

高压管是放射材料的第三道防护。

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Fill a lightweight material with hot air, helium or hydrogen, and you have a vessel that floats in the air.

在容器中充入热气、氦气或氢气等轻气体，就能造就一艘漂在空中的飞船。

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Materials for external attachments and vessel support welded directly to the pressure retaining parts shall be similar material as the pressure parts.

直接焊接到压力保持部件上的外部配件及容器支架的材料应与压力部件相同。

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The third mistake was that, because the workers were allowed to bypass the time-consuming mixing process in the tower, with its automatic controls for preventing such things happening, they were free to dump their material into a vessel that was not designed to prevent the accumulation of a critical mass sufficient to support a chain reaction.

ECONOMIST: All over in a flash

Made of hardened steel that is between four and eight inches thick, the integrity of the containment vessel is critical in preventing enormous quantities of radioactive material from escaping into the environment.

FORBES: New Video From Fukushima Shows Containment Vessel Dome Amid Debris

The material, which was loaded on a schooner sailing vessel, will be sculpted into a piece of art called Nowhere Island.

BBC: Nowhere Island Olympic art team head home