SDK       
noun [ C ]  computing specialized uk/ˌes.diːˈkeɪ/ us/ˌes.diːˈkeɪ/
 软件开发工具包(software development kit的缩写)
abbreviation for software development kit: a set of tools and programs that allow developers (= people who create computer products) to create software applications (= computer programs designed for a particular purpose) for particular types of computer systems or mobile phones
  Attending this course is a great way to quickly get up to speed on the latest iPhone SDK. 参加这个课程是快速掌握最新iPhone软件开发工具包的一个好方法。 
 The company's products are available as standalone applications and SDKs.
 Synonym: devkit
 - More examples
 - I don't agree with the company charging for the SDK.
 - Which version of the SDK operating system is supported by the applications?
 - Theoretically, you could use the SDK together with a freeware or shareware C compiler and start coding.