Discovery was hours from launching on it final voyage to the ISS on November 5 when technicians found a hydrogen leak and later a series of long cracks on the shuttle's external fuel tank.
一开始技术人员发现有氢气泄漏，后来在外部燃料罐上发现了一些裂缝，当时是11月5日离发现号前往国际空间站的发射前的几小时，这是它的最后一次飞行。
When something falls through the cracks, it is forgotten or overlooked.
疏忽了某事，指这件事被忘记了，或是忽略了。
When something falls through the cracks, it is forgotten or overlooked.
现在我有时间了，我会看的。当某东西掉落通过裂缝，就是被忘记忽视了。
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