有位工程师在泰米尔那德邦经营着一家采石场，开采石头用作道路、房屋建造中使用的沙子石子的原料。
Take an engineer who runs a quarrying firm in Tamil Nadu, providing stone for sands, grits and gravels used in everything from houses to roads.
与焊接金属片不同的是，软件工程师靠编写代码将原料有机的结合在一起。
Instead of welding pieces of metal, software engineers join stuff by writing code.
这个分析很明显的把注意放在原料所来带的能源上，并且化学工程师也在寻找着恢复这些能源的方法。
The analysis pays explicit attention to energy that is carried by material streams, and chemical engineers look for ways to recover this energy as well.
应用推荐