Between 1832 and 1837 he developed a working model of an electric telegraph, using crude materials such as a home-made battery and old clock-work gears.
在1832年至1837年间，他使用自制电池和旧钟表齿轮等原始材料开发了电报的工作模型。
Crude material
原声例句
雅思阅读真题
哲学问题
His chief reason in favour of this view is that we seem to have a priori knowledge as to space and time and causality and comparison, but not as to the actual crude material of sensation.
他支持这种观点的主要原因是我们似乎对空间和时间以及因果关系和比较具有先验知识，但对感觉的实际原始材料却没有。
英语百科
Raw material
![Anthracite coal stockpile at the shipping area of a mid-slope coal processing plant. The road leading up beyond the stockpile leads down from a Mountain top strip mine which sources the materials.](/Images/godic/202501/07/FAB's_BlaschakCoalCompany_IMG_4456_Cleaned_stove_coal_Heap_ready_for_front_end_loader_and_Dump_trucks3054.JPG")
![Latex being collected from a tapped rubber tree](/Images/godic/202501/07/Latex_-_Hevea_-_Cameroun3054.JPG")
A raw material, also known as a feedstock or most correctly unprocessed material, is a basic material that is used to produce goods, finished products, energy, or intermediate materials which are feedstock for future finished products. As feedstock, the term connotes these materials are bottleneck assets and are highly important with regards to producing other products. An example of this is crude oil, which is a raw material and a feedstock used in the production of industrial chemicals, fuels, plastics, and pharmaceutical goods; lumber is a raw material used to produce a variety of products including furniture.