API = Application programming interface is a connection between computers or between computer programs. It is a type of software interface, offering a service to other pieces of software.

API=应用程序编程接口是计算机之间或计算机程序之间的连接。它是一种软件接口，为其他软件提供服务。

L2 = Layer two refers to a secondary framework or protocol that is built on top of an existing blockchain system.

L2=第二层是指建立在现有区块链系统之上的二级框架或协议。

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