Previous attempts to use cardiac muscle power to run pacemakers relied on piezoelectric materials.

之前使用心脏肌肉能量运行起搏器的尝试是依赖于压电材料。

Piezoelectric materials can have different structures.

压电材料可以有不同的结构。

Piezoelectric materials turn mechanical stress, like pressure, sound waves, and other vibrations into electricity and vice versa.

压电材料将压力、声波和其他振动等机械应力转化为电能，反之亦然。

And we thought, OK, let's combine it with a piezoelectric material.

我们想，好吧，让我们将它与压电材料结合起来。

Let's look at quartz, a piezoelectric material made of silicon and oxygen.

让我们看看石英，一种由硅和氧制成的压电材料。

And the stronger the compression on piezoelectric materials, the larger the voltage generated.

并且对压电材料的压缩越强，产生的电压就越大。

And on the outer shell we have the piezoelectric material, the material that when the inside gets bigger, the outside produces the electricity.

在外壳上我们有压电材料，当内部变大时，外部就会产生电力。

Scientists have created a variety of synthetic piezoelectric materials and found applications for them in everything from medical imaging to ink jet printers.

科学家们创造了多种合成压电材料，并在从医学成像到喷墨打印机的各个方面找到了它们的应用。

First we fill them up with the piezoelectric material, which is represented in yellow in the bottom figure, and then we fill it up with the stimuli-responsive material that is the light blue in the bottom figure.

首先我们用压电材料填充它们，在下图中用黄色表示，然后用刺激响应材料填充它们，在下图中用浅蓝色表示。