Because of the high demand for both aircraft production and for spruce to be used as a major material in manufacturing parts, forests of this popular wood were rapidly depleted.
由于飞机生产的高需求和云杉都被部分用作制造的主要材料，木材森林的这种流行正在迅速枯竭。
But once the capsules are depleted, the material can no longer mend itself.
荚囊一旦使用过了，材料就无法再一次进行修复。
The surface region was also depleted in CH, but the content of anhydrous material was little affected.
表面区域的CH也被大大地减少，但是无水材料的含量受到的影响很小。
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