The misted smokes on the carvings in Longmen Grotto Cave had been formed for quite a long time, and cause serious damage to the environment and effect of this valuable art works.
龙门石窟洞窟雕刻品表面黑色油烟渍的形成由来已久。它严重破坏了石窟的环境风貌，也影响对石窟艺术的研究和观赏。
The misted smokes on the carvings in Longmen Grotto Cave had been formed for quite a long time, and cause serious damage to the environment and effect of this valuable art works.
龙门石窟洞窟雕刻品表面黑色油烟渍的形成由来已久。它严重破坏了石窟的环境风貌，也影响对石窟艺术的研究和观赏。
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