Engineers have spent 18 months redesigning the external tank and incorporating the changes recommended by the Columbia Accident Investigation Board.

报道说，工程师们花了18个月的时间重新设计外部燃料箱，同时参考了“哥伦比亚”号事故调查组提出的修改建议。

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Earlier this week, a panel monitoring Nasa said the agency had failed to meet three of 15 recommendations made by the Columbia Accident Investigation Board for the safe resumption of shuttle flights.

本周早些时候，一个美国宇航局监督小组声称，宇航局未能满足哥伦比亚事故调查委员会为恢复航天飞机安全飞行而提出的15条意见中的3条。

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The loss of the space shuttle Columbia in February of two thousand three led to an investigation by the Columbia Accident Investigation Board.

VOA: special.2009.12.30

To meet this goal, we will return the space shuttle to flight as soon as possible, consistent with safety concerns and the recommendations of the Columbia Accident Investigation Board.

CNN: Bush: 'It is time for America to take the next steps' in space

But the corrective actions suggested by the Columbia Accident Investigation Board this week to prevent future shuttle disasters will likely put a damper on those plans, according to space experts.

CNN: Shuttle not likely to fly by spring, experts say

The Columbia Accident Investigation Board, which is looking into the cause of the shuttle disaster, gave NASA permission to release the photos because it determined they were not relevant to the probe.

CNN: More recovered shuttle video released