对于美国国债来说，利率上调是主要的风险；而对于公司债券、市政债券和其他债券，其相关资产的财政稳健程度又会引发另一种风险。
For Treasury bonds, rising interest rates are the main form of risk; for corporate, municipal and other bonds, the financial soundness of the underlying assets raises another kind of risk.
重点介绍了实验室能力验证的基本概念、结果评价方式及与之相关的稳健统计技术。
Basic concept of laboratory proficiency testing, result appraisal way and its relative robust statistical techniques were mainly presented.
相关试验证明，本方案的水印稳健性和不可见性均达到了相当水平，运算复杂度也比较低。
The experimental results demonstrate that the watermark has the considerable perceptual invisibility and robustness, and the operation complexity is comparatively low in this scheme.
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