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.
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.
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