declared monuments
宣布纪念碑
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
youdao
Many of the monuments declared by presidents have been named national parks or given other titles by Congress.
VOA: special.2009.09.28
Teddy Roosevelt himself declared eighteen national monuments.
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