The key here is that the ordering system is implemented to accept a single record, whereas the input into the mediation module is a nested batch message.
这里的关键是将订单系统实现为接收单个记录，而到中介模块的输入是嵌套式批处理消息。
You should be able to type into the input field, press the Tab key, and then see the result shown in Figure 3.
应该能够在输入字段中输入内容，按下tab键后可以看到图3所示的结果。
B. use a mixer to add the two signals, and then use mixed signal into a key input of a gate.
使用混音器混合这两个信号，然后混合信号送入噪声门的旁链输入。
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