translation.en: Another fun fact is, this is what we actually send out there as a standard diagnostic tool, but here in this envelope I have 30 different foldscopes of different configurations all in a single folder.
translation.zh: 另一个有趣的事实是， 这是我们实际发送出去的 所谓标准诊断工具， 但是这个信封里， 我装了30个不同构型的 纸折显微镜， 全都放进了一个文件夹里。