有时，心脏体积或者厚度的变化与更加严重的疾病有关，在下文中会提及。

Sometimes, the change in size or thickness of the heart can be related to a more serious condition(s), such as those described below.

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如果我们要讨论它的体积，我们要用的是表面面积，也就是4πr的平方，乘以厚度dr

So if we want to talk about the volume of that, we just talk about the surface area, which is 4 pi r squared, and we multiply that by the thickness d r.

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换言之，当这些阵列具有传统晶体硅太阳能电池(crystallinesolar cell)的厚度时，它们的体积相当于两微米厚的薄膜的体积。

In other words, while these arrays have the thickness of a conventional crystalline solar cell, their volume is equivalent to that of a two-micron-thick film.

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