当源活动结束运行时，链接另一端的目标活动便开始运行。
When the source activity finishes running, the target activity at the other end of the link runs.
一般用例将以许多小消息结束，当涉及到远程接口时，端到端通信开销会对响应时间和吞吐量造成很大的影响。
The average use case will end up with lots of small messages, and the end-to-end communication overhead when remote interfaces were involved had a major impact on response time and throughput.
记住 MidiOut 客户端只订阅了 MIDI 短消息和特别的结束事件，因此可以忽略其他的 MIDI 事件，例如 Meta 或者 System-Exclusive。
Remember that the MidiOut client has only subscribed to MIDI short messages and a special closing event so we can ignore other MIDI events such as Meta or System-Exclusive.
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