E. a non-summary property in a category or struct in which you use just get; using a semicolon (usually coupled with set;) to point which the compiler ought to generate the human body in the get accessor quickly. 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. This big difference in syntax is in https://sites.google.com/view/aipljoydistrict/m3m-iconic-business-tower