而后追根溯源，阐释了消费信贷的经济学理论基础，即时间偏好理论、生命周期假说和持久性收入假说。
Then, tracing to its source, explains the economics theoretical foundation of the consumer credit, that is, time-favor theory, life-cycle hypothesis and permanent-income theory.
它确实会花更多的时间去应用事件来构建系统的当前状态。但是处理器是非常快的，顺序地应用事件进行溯源的时候是微秒级的。对于大多数领域来说，性能不是问题。
It takes more time to apply events to build up the current state. But processors are really fast; applying events takes on the order of microseconds. For most domains, performance isn't a problem.
北斗系统时间基准（北斗时），溯源于协调世界时，时差信息在导航电文中发播；
The BDT is related to the Coordinated Universal Time, and the time bias information is broadcast in the navigation message.
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