Cracks discovered in the shuttle's external fuel tank have sparked a lengthy investigation.

对于在穿梭机外部燃料罐发现裂缝已经展开了详尽调查。

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The only problem is that such a plan would require the construction of an entirely new external fuel tank.

唯一的问题是这样的计划将需要一个全新的外部燃料箱的建造。

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To keep pace with the changing needs of the global UAS market, Schiebel now offers an external fuel tank for extended range and endurance.

为了保持与全球UAS不断变化的市场需求步伐，Schiebel现在提供了一个外部燃料箱以扩展范围和耐力。

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He said technicians are confident that they have fixed the hydrogen leak, which was found while NASA crews were filling the shuttle's external fuel tank.

VOA: standard.2009.06.16