With this approach, all interactions between the client and the intermediate middleware occur asynchronously using a collection of input and output message queues.
通过这种方法，客户机和中间件之间的全部交互都会使用一个输入和输出消息队列集合异步进行。
Figure 6 shows the second approach, which USES only a single input and output criterion, but sets the minimum multiplicity of all disconnected inputs and outputs to zero.
图6显示的是第二种方法，该方法只使用单个输入和输出条件，但它会把所有未连接的输入和输出的最小增殖次数设置为零。
In testing, a common approach is to divide the input and output domains into equivalence classes.
在测试中，通常的做法是将输入和输出分为两个等价类。
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