顺着供应链往下找，来到了原材料层。

Further down the supply chain lie raw materials.

youdao

找两根结实的长树枝，把它们每一个边像画轴一样都卷进材料里，在每个末端都留一英尺的木头在外面。

Find two long, sturdy branches and roll them into the material on each side like a long scroll, leaving about a foot of wood exposed at each end.

youdao

不要再去下载听力材料或者买各种各样的学习教程了，找一些人去使用外语当面交谈！我个人比较喜欢以下的一些资源。

Rather than downloading podcasts and buying too many courses, meet up with actual people and use the language! A few resources I like to use include.

youdao

Likewise for mass, we will take a chunk of some material and we will call it a kilogram.

质量也是这样,我们找来一大块材料,然后称它为 1 千克

耶鲁公开课 - 基础物理课程节选

And as you'll see by your handout, I've attempted tend to trace it.

你们可以看看课堂材料，我尝试着去找，了找它的起源，我能找到。

麻省理工公开课 - 计算机科学及编程导论课程节选