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反应本身也在纳米管内部发生。这种中空的纳米管只有20纳米厚的薄壁，所以具有巨大的内表面积。
The reaction itself also takes place inside the nanotubes, which are hollow and have a large internal surface area thanks to their thin 20-nanometer-thick walls.
最后分别分析了材料性质、截面长宽比、管长和壁厚对最终变形模式的影响。
Moreover, the influences of material property, section properties, tube length and thickness to ultimate deformation modes are studied respectively.
提出的管坯壁厚精度概念极其控制方法具有普遍性，对于其它薄壁筒形件的制造工艺具有参考作用。
The introduction of the concept of bellows wall thickness accuracy has the universal significance and reference value for manufacturing technology of other thin wall tube like products.
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