甚至更糟糕的是，假设我们按时交付了代码，但是它存在一些致命的缺陷。
Or, even worse, suppose we deliver the code on time, but it has some obscure but critical defects.
英国议会已经认定，如果线粒体dna存在缺陷并且会导致母体将致命性疾病遗传给孩子，那么可以将其替换。
Parliament has ruled that inherited DNA in the mitochondria can be replaced if they are defective and the cause of devastating diseases that are passed down from mothers to their children.
苏联模式的系统结构存在致命的缺陷。
A fatal deficiency exists in the systematic structure of the Soviet model.
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