书页通常使用的材料是羊皮纸，羊皮纸是一种动物的皮肤，其在张力的作用下被拉伸和变干，因此它会变得非常平整，并且你可以在上面写字。

The material typically used for the pages was parchment, which is animal skin that's stretched and dried under tension, so it become s really flat and can be written on.

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如图2 b中所示，在突然拉伸的薄膜上，有一处蛋白质含量少而且局部表面张力大的地方。

As illustrated in figure 2b, a suddenly stretched film has a lower protein concentration and hence a higher local surface tension.

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本文叙述了海底光纤复合电力电缆的设计、制造及进行的盘绕、拉伸、张力弯曲等机械性能试验。

This paper presents the design and production of submarine composite power cables with optical fibers as well as the mechanical tests-wrapping test, tensile test and bending test.

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