The second system is the voluntary, behavioral system.

第二套系统是自发行为系统。

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Requirements are typically customer-specified behavioral constraints on the implementation of a system.

需求通常是客户指定的关于系统实现的行为约束。

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A software architecture represents the structural and behavioral aspects of a system.

软件架构表示系统的结构和行为方面。

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To describe the prevalence of binge drinking, the CDC analyzed data from its 2011 Behavioral Risk Factor Surveillance System, an annual telephone survey, and the national 2011 Youth Risk Behavior Survey, an anonymous questionnaire completed by high school students nationwide.

CNN: CDC: 1 in 5 high school girls binge drink

According to data from the Centers for Disease Control and Prevention's Behavioral Risk Factor Surveillance System Survey 2004, more than 70% of adult Milwaukeeans reported that they had had at least one alcoholic drink within the past 30 days--the highest percentage on our list.

FORBES: America's Drunkest Cities

Some in the field have been frustrated by the classification system, which focuses on behavioral symptoms and not on chemical changes or brain abnormalities.

WSJ: Revised Psychiatric Manual Faces Mixed Reviews