这种复杂性导致了即使是经过详细测试的系统，也会在部署后出现性能和功能达不到要求的情况。
As a result, even systems that have been thoroughly tested can fail to provide adequate performance and functionality post-deployment.
经过详细分析后发现，这个比例已经是最佳的汉莎航空公司的成本和风险的原因。
After detailed analysis this ratio has been found to be optimal for Lufthansa for both cost and risk reasons.
产品要求说明书一般在启动阶段不够详细，而在后来的过程中，当产品的特征经过逐步思考与推敲后逐渐地详细起来。
The product requirements will generally have less detail during the initiation process and more detail during later processes, as the product characteristics are progressively elaborated.
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