But because electron microscopes work by passing electrons through an object, tissue slices usually have to be very thin.

但是因为电子显微镜的工作原理是让电子穿过物体，所以组织切片通常必须非常薄。

We're back home now and I wanted to make sure that this microscope works and I can show you guys it works.

我们回到家了。我想先确认一下这个显微镜是没问题的，我也会让你们看看它到底行不行。