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。
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。
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