近年来这方面的研究开发主要是围绕结构 、 合成 、 表征和催化反应等方面开展的. The issue is "what's the main difference...", but essentially the most voted responses answer with "instead of telling you exactly what is the difference I am telling you how you need to get the job done" . To summarize, a WPF software has two levels: https://medium.com/@Navrajinfratech/