It is always a tough issue for both our road management department and theory field that how to solve the problem of investment and financing of common main stem road.
如何解决普通干线公路的投融资问题，是一直困扰着我国公路主管部门和理论界的难题。
It is always a tough issue for both our road management department and theory field that how to solve the problem of investment and financing of common main stem road.
如何解决普通干线公路的投融资问题，是一直困扰着我国公路主管部门和理论界的难题。
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