根据常识，如果要在电话网络中加上第四个城市，那么电话线的长度就必将增加。
Common sense says that if you add a fourth city to your telephone network, the total length of your cable will have to increase.
工程师必须知道路径的深度曲线去估计电话线的长度然后才能制造这样一根线出来。
The engineers had to know the depth profile of the route to estimate the length of cable that had to be manufactured.
你得学会培养电话来访人，因为正是他们向你倾诉他们的危机和孤独时，那冗长的故事才能增加你的平均通话长度。
You learn to cultivate the callers who increase your average as they take you through long stories of crisis and loneliness.
你得学会培养电话来访人，因为正是他们向你倾诉他们的危机和孤独时，那冗长的故事才能增加你的平均通话长度。
You learn to cultivate the callers who increase your average as they take you through long stories of crisis and loneliness.
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