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。

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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。

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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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