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.

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。

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The pain and increased surface heat may be severe, and it is not rare to have some constitutional reaction if the involved area is large.

疼痛和表面灼热可能很重，如果累及的面积很大，也可出现全身反应。

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But along with the reaction, the viscosity of acid increased in the surface of rock, while a large scale of decline of reaction rates by contrast.

但随着反应时间的增加，在岩石表面处酸液黏度增加，使得反应速率出现较大幅度的下降。

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