所有的启发式分析等级都占用多余的处理器时间，并且很多反病毒产品使用启发式分析时很明显的降低系统性能。
All levels of heuristic analysis add processing overhead to scanning time, and for some products, the slower performance can be all too obvious.
风险等级的评估是基于在分析了风险和保护因素、进行直接的自杀想法和行动调查后，做出的临床判断。
The assessment of risk level is based on clinical judgment after reviewing the risk and protective factors and conducting a direct inquiry of suicidal thoughts and actions.
世界证券市场度过了剧烈动荡的一周，标准普尔（世界权威金融分析机构——译者注）首次将美国信用等级降到了AA+。
It was a tumultuous week on the world’s stockmarkets, after Standard &Poor’s downgraded America’s credit rating for the first time, to AA+.
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