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. Fields are the sole mechanism ways to retail outlet info on course level. Fields are conceptually variables at class scope. If you wish to store some information to situations of the courses (objects) you should use fields. Lazy Initialization: In case you have a property https://businessviewpoints.blogspot.com