A join point is "a well-defined point in the program flow." 3 There are many types of join points, such as a method call or a method return, which can be either a normal return or a thrown exception.
一个连接点是：一个在程序流程中定义明确的点。3连接点有很多类型，正如一个方法的调用或一个方法的返回，都可以是一个正常的返回或者抛出一个异常。
An exception is an event that occurs during the execution of a program that disrupts the normal flow of instructions.
在程序执行过程中，所发生的破坏正常指令流的事件，叫做异常。
Contracts refer to conditions that always hold true in the normal execution flow of a program.
合同请参阅总是在正常执行流的程序适用的条件。
Contracts refer to conditions that always hold true in the normal execution flow of a program.
合同请参阅总是在正常执行流的程序适用的条件。
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