基于每小时、每分钟或每秒钟CPU时间进行的事务和HTTP请求计量是最准确的计费和计量模式，因为可以计算总成本中每个事务的成本。
Transaction and HTTP request metering based on CPU time per hour, minute, or second is the most accurate billing and metering model, as each transaction can be measured for total cost.
有时，您想要串联数字值，比如，计算航班中转的总成本。
Sometimes you would like to concatenate numeric values - for example, calculating the total costs of the flight connections.
来自Widget Co客户之一的订单会作为一个Widget对象列表来实现，并使用一个额外的方法来计算订单的总成本，即。
An order from one of WidgetCo's customers is implemented as a list of Widget objects, with one extra method to compute the order's total cost.
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