而壁画艺术，更是一度被看作走到了尽头。
洞穴壁画艺术似乎在旧石器时代晚期达到了顶峰，而当时猎物的数量正在减少。
Cave art seems to have reached a peak toward the end of the Upper Paleolithic period, when the herds of game were decreasing.
修复世界艺术杰作和壁画的过程中存在种种风险，而如何平衡这些风险本身就是一种艺术。
Balancing the risks associated with restoring the world's masterpieces and frescoes is an art in itself.
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