The space structure and the whole environment is the key of the protective planning and design of the historical street area.
保护历史街区空间格局，乃至整体环境是保护规划设计的关键所在。
After 1949, the caves were declared historic monuments, and the steady erosion by wind and water was slowed down through judicious tree planning and the construction of protective barriers.
1949年后，这些洞被宣布为历史古迹，通过远见卓识的植树计划和防护屏障建设，风蚀和水蚀的速度慢了下来。
The dynamic and digital real-time simulation of power system is believed as an indispensable tool for power system planning, protective and control devices designing and testing.
电力系统动态数字实时仿真已成为规划电力系统，设计与检验电力系统控制、保护以及调度设备的主要工具。
The dynamic and digital real-time simulation of power system is believed as an indispensable tool for power system planning, protective and control devices designing and testing.
电力系统动态数字实时仿真已成为规划电力系统，设计与检验电力系统控制、保护以及调度设备的主要工具。
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