本文在分别评述故障树分析方法、多阶段任务系统和不完全覆盖的基础上，由简单到复杂，逐步深入研究相关的系统可靠性分析方法。
We step by step find approaches for system reliability from simple to complex upon introducing fault tree analysis, phased mission systems and imperfect coverage, respectively.
两组动脉人工血管均通畅，内膜完整，但内皮细胞覆盖不完全。
The neointima of vascular graft formed completely, but the coverage of vascular endothelial cells was incomplete in both groups.
我希望以上是这个专题比较公正和准确的总结，但我敢肯定，我已经错过了一些东西，或者覆盖一些内容不完全，缺少一些可能会有所帮助的细节。
I hope that the above is a fair and accurate summary of the topic, but I'm sure I've missed a few things and covered others incompletely or in less detail than might be helpful.
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