translation.en: But the thing that struck me about all of these different projects is that they really had to be built from scratch, down to the level of the electronics and the printed circuit boards and all the mechanisms all the way up to the software.
translation.zh: 但是在做这些项目的时候 最让我感到意外的其实是 每个项目都必须从头开始 从头设计电路 印刷和制作电路板 到控制软件的编写, 都需要从头做.