The last iteration, as previously mentioned, was planned to focus on final defect cleanup and complex testing that was not practical during development iterations.

如前面所提到的，最后的迭代计划着重于在开发迭代中不能实现的最终的缺陷清理和复杂的测试。

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However, he said, understanding the molecular nature of this single genetic defect, which is at the root of a familial form of such a complex disease, offers invaluable clues.

然而，他又说，理解单个遗传缺陷的分子本质，其是如此复杂疾病的一种家族性形式的根源，提供了无价的线索。

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Truncus arteriosis is a complex defect where there is a single (normally there are two separate arteries) vessel arising from the heart that forms the aorta and pulmonary artery.

共同动脉干是一种复杂的缺陷，一个单一的血管从心脏发出，(正常时是两个互相分开的动脉)。

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