敦煌石窟的保护需要的是知识和科学。
What were needed for the protection of the Dunhuang grottoes were knowledge and science.
保护敦煌石窟，必须先从掌握周围自然环境入手。
To protect the Dunhuang grottoes, one has to start with an understanding of the surroundings.
保护敦煌石窟，必须先从掌握周围自然环境入手。
To protect the Dunhuang grottoes, one has to start with an understanding of the surroundings.
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