sytem-building theory
英
美
- This is a question for historical generalisation rather than for pure theory.
这是一个历史的概括而不是纯理论的问题。
- Obviously, many departments of application science are the extendibility of pure theory and experiment.
十分明显，应用科学的许多部门都是纯理论工作和实验工作的实际延伸。
