Designing application programmer interfaces, APIs, is hard.
设计应用程序接口，API，是很难的。
Most sites like these also offer application programmer interfaces (APIs) which let third parties write software that communicates directly, securely and efficiently with the site's servers.
类似的大多数站点同时也提供应用程序接口(APIs)，支持第三方编写能与站点服务器进行直接、安全及高效对话的软件。
As a programmer, much of your challenge is to cope with unceasing change: new protocols, application programming interfaces (APIs), customer requirements, hardware constraints, and so on.
作为程序员，很多挑战是要应付不断的更改：新的协议、应用程序编程接口(API)、客户需求、硬件约束等。
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