还是那个问题，请各位高手指点！

大家好，关于这三个单词（critical defects, defective product, epidemic failure）的理解。第一个可以理解为严重破损，第二个为次品，第三个为什么哪？在合同里面他们是是这样解释的

“crictical defects”are defects or failure in the product, which are assessed as likely to result in injury to person, significant material damage or other unacceptable consequence. In addition, defects or failures in the product, which are detected during buyer's ongoing reliability testing, will also be considered as "crictical defects"

"defective product" is a pr
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