这些历史建筑的保护需要政府和公众的共同努力。

The ___preservation of these historic buildings requires joint efforts from the government and the public.

国家公园的建立对自然环境的保护起到了重要作用。

The establishment of national parks plays a key role in the ___preservation of natural environments.

盐腌是一种传统的食物保存方法。

Salting is a traditional method of food ___preservation.