偏离频率

departure frequency的用法和样例：

例句

The objective function, the expected daily profit defined as the ticket revenue minus the operating and customer waiting costs, is discontinuous at changes in the bus frequency.目标函数是期望日利润，定义为票价收入减营运及乘客等候成本，然而，目标函数是不连续的且断点发生在发车频率改变处。

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