The example messages in Figure 5 show synchronous messages; however, in sequence diagrams you can model asynchronous messages, too.
图 5 中的消息实例显示同步消息；然而，在序列图中，你也能为异步消息建模。
Verify that synchronous and asynchronous service calls are logging invocation confirmation messages to console output, as shown in Figure 19.
验证同步和异步服务调用正在将调用确认消息记录到控制台输出，如图19所示。
XMS offers a choice of synchronous and asynchronous styles for receiving messages.
XMS为消息的接收提供了同步和异步两种选择。
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