对S- MAC 协议的改进主要有两种方式：动态调整、区别控制包与数据包的发送条件进行发送。
The S- MAC protocol can achieve better performance by allowing dynamic scheduling, and sending control and data packets under different transmission conditions.
不过，图中消息箭头的语义规定只能在条件有效时发送消息。
The semantics of the message arrows in the diagram do, however, dictate that the message may be sent only if the condition is valid.
用户可以按下ctrl键，然后单击浏览器的Refresh按钮，以阻止浏览器发送某个条件GET。
A user can hold down the Ctrl key and click the browser's Refresh action to prevent the browser from sending a conditional GET.
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